Sabtu, 30 November 2019

Stellar Black Hole in Our Galaxy Is So Massive It Shouldn't Exist - Livescience.com

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  1. Stellar Black Hole in Our Galaxy Is So Massive It Shouldn't Exist  Livescience.com
  2. Black hole discovery: How an 'impossibly' heavy black hole will 'update astronomy books'  Express.co.uk
  3. Scientists confused: black hole so big it 'shouldn't even exist' found  TweakTown
  4. Scientists find ‘monster’ black hole so big they didn’t think it was possible  The Washington Post
  5. Monster black hole that is so big it 'should not even exist' was discovered  ABC News
  6. View full coverage on Google News

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2019-11-30 12:00:00Z
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Jumat, 29 November 2019

Giant black hole 'should not even exist,' stunned scientists say - Fox News

Scientists have discovered a huge black hole that is challenging long-held assumptions about the cosmic bodies in the Milky Way.

Stellar black holes are formed by the collapse of massive stars. The mass of an individual stellar black hole in our galaxy has long been estimated to be no more than 20 times that of the Sun, according to researchers.

Now, however, an international team of scientists led by Prof. Liu Jifeng of the National Astronomical Observatory of China of the Chinese Academy of Sciences (NAOC), has discovered a monster stellar black hole with a mass 70 times greater than the Sun.

FIRST-EVER BLACK HOLE IMAGE REVEALED

"Black holes of such mass should not even exist in our Galaxy, according to most of the current models of stellar evolution," said Prof. Liu, in a statement.

Artist's impression of LB-1.

Artist's impression of LB-1. (Yu Jingchuan, Beijing Planetarium, 2019)

"We thought that very massive stars with the chemical composition typical of our Galaxy must shed most of their gas in powerful stellar winds, as they approach the end of their life,” Liu added. “Therefore, they should not leave behind such a massive remnant. LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation."

The black hole, named LB-1, is 15,000 light-years away. A light-year, which measures distance in space, equals 6 trillion miles.

3 BLACK HOLES POSSIBLY SEEN COOKING THEIR GALAXIES ALIVE

A paper on the discovery has been published in the journal Nature.

Researchers made the discovery using China’s Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The telescope looks for stars that orbit an invisible object, pulled by its gravity, according to the scientists. Previously, stellar black holes could only be discovered by identifying X-ray emissions created when they devoured gas from a companion star.

After the black hole was spotted using LAMOST, the Gran Telescopio Canarias in Spain and the Keck I telescope in the U.S. were used to establish its physical parameters.

DISTANT ALIEN PLANET WITH THREE RED SUNS DISCOVERED

In the statement, experts note that the discovery of LB-1” fits nicely” with another breakthrough in astrophysics – the detection of ripples in space-time caused by black hole collisions in distant galaxies. The ripples have been identified by the Laser Interferometer Gravitational-Wave Observatory (LIGO) in the U.S. and the Virgo gravitational wave detector in Italy.

"This remarkable result along with the LIGO-Virgo detections of binary black hole collisions during the past four years really points towards a renaissance in our understanding of black hole astrophysics," said LIGO Director Prof. David Reitze of the University of Florida, in the statement.

WHAT'S INSIDE A BLACK HOLE?

Earlier this year, in a separate project, scientists released the first-ever image of a black hole, revealing the distant object in stunning detail.

The groundbreaking image was captured by the Event Horizon Telescope, an international project involving telescopes across the globe that describes itself as a “virtual Earth-sized telescope.” Telescopes in Hawaii, Arizona, Chile, Mexico, Spain and the South Pole participated in the ambitious research project.

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The black hole in question was spotted in galaxy Messier 87 (M87) that is 55 million light-years away.

Follow James Rogers on Twitter @jamesjrogers

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2019-11-29 16:11:25Z
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A 'Mole' Isn't Digging Mars: NASA Engineers Are Trying To Find Out Why - NPR

A photo of the mole on NASA's InSight lander trying to drill into the Martian surface. NASA hide caption

toggle caption
NASA

There's a mole on Mars that's making NASA engineers tear their hair out.

No, they haven't discovered a small, insectivorous mammal on the red planet.

The mole vexing engineers at the Jet Propulsion Laboratory in Pasadena is a scientific instrument known as the Heat Flow and Physical Properties Package, or HP3 — or just "the mole" — carried on NASA's InSight probe that landed on Mars a year ago.

"The mole is designed to measure heat flow coming out of the interior of Mars," says Troy Hudson, InSight's instrument system engineer.

Scientists are interested to know how much heat is still being generated inside the core of the once geologically active Mars. To do that, the mole has to bury itself about 16 feet below the Martian surface so it won't be affected by daily temperature fluctuations.

The mole is basically a tube about 16 inches long and an inch in diameter. It has a pointy tip and an internal hammer that works like a kind of pile driver to pound the instrument into the ground.

The frustrations began last February when the digging started. Instead of going down to 16 feet, it got stuck after just 14 inches.

Hudson says he and his team decided the problem was related to bouncing.

Just like a gun recoils when you fire it, the mole recoiled ever so slightly every time the hammer tried to drive it into the ground. So instead of going down, it bounced in place.

Some of the problem may be caused by uncertainty about the size of the grains of Martian sand. It turns out that pushing a probe into something like flour is very different than pushing it into a bowl of granulated sugar.

The low pressure on Mars also changes the way the dirt behaves compared to soil on Earth.

Engineers thought they might be able to prevent the bouncing if they used the scoop on InSight's robotic arm to press against the mole as it hammered. They tried that a few weeks ago — and it worked.

"For the first time in 8 months we have definite forward progress," Hudson told NPR at the time.

But Hudson knew there was another looming problem. Eventually, the top of the mole would be flush with the Martian surface, and there would be nothing for the scoop to press against.

So they came up with a new plan.

"We moved the scoop over to a different position nearby, and pushed hard on the soil, hoping that would transfer force to the mole through the soil rather than directly," he says.

They sent instructions for the scoop to press, the mole to hammer, and for Insight's camera to record what happened.

Hudson says he was horrified when he saw the pictures.

InSight Mole

"I was very distraught," he recalls.

The mole had backed almost half-way out of the hole, inadvertently undoing much of their progress.

Hudson is pretty sure he knows what happened. Without the scoop pressing on the mole, it started bouncing again.

"When it does that, loose soil in front of the mole can infiltrate in front of the tip, filling up the space that occurs whenever it bounces," Hudson says. "Then it's just bounce, bounce, bounce, bounce, and more material fills in and it ends up backing out of the ground."

Hudson says he and his team are confident they can use the scoop press technique to get the mole back down to where it was. They've already made an inch and a half of progress.

Once the top of the Mole is again flush with the surface, he says "we're going to have to come up with a new way to get it underground fully and we haven't figured out exactly what we're going to do there, yet."

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2019-11-29 13:16:00Z
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Chinese astronomers discovered a black hole so big it shouldn't exist according to current science - Business Insider

LB-1 black holeAn artist's impression of the LB-1 black hole, recently discovered by Chinese scientists.YU Jingchuan, Beijing Planetarium, 2019.

  • Chinese scientists discovered a stellar black hole that's so large it shouldn't exist based on current theories of black hole formation.
  • LB-1 is 70 times greater than the mass of our sun, but scientists had believed that stellar black holes in our galaxy could not be bigger than 20 times the mass of the sun.
  • The head of the team that made the discovery said that: "Black holes of such mass should not even exist in our Galaxy, according to most of the current models of stellar evolution."
  • Prof. David Reitze of the University of Florida said: "This discovery forces us to re-examine our models of how stellar-mass black holes form."
  • Visit Business Insider's homepage for more stories.

Chinese scientists discovered a black hole so that's so big that it throws into question previous beliefs about how black holes are formed.

The newly discovered black hole, called LB-1, has a mass 70 times greater than the mass of our sun, China's Academy of Sciences said in a statement.

The statement noted that scientists had previously believed that an individual stellar black hole — formed when a star collapses — that's in our galaxy could only weigh as much as 20 times the mass of our sun.

This is because they believed that stars start to lose their gas as they die, and lose mass as a result. 

However, Professor Liu Jifeng of the National Astronomical Observatory of China, who led the team who made the discovery, said that LB-1, under this theory, was too big to exist.

"Black holes of such mass should not even exist in our Galaxy, according to most of the current models of stellar evolution."

"LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation," he said.

"We thought that very massive stars with the chemical composition typical of our Galaxy must shed most of their gas in powerful stellar winds, as they approach the end of their life. Therefore, they should not leave behind such a massive remnant."

LB-1 is 15,000 light years from Earth.

black holeThis computer-simulated image shows a supermassive black hole at the core of a galaxy. The black region in the center represents the black hole’s event horizon, where no light can escape the massive object’s gravitational grip.NASA, ESA, and D. Coe, J. Anderson, and R. van der Marel (STScI)

The discovery was published in the scientific journal Nature on Wednesday. The black hole was discovered by looking at stars that were being pulled in by an invisible object instead of the usual technique of looking at the x-rays emitted by a black hole, which not all black holes emit.

The University of Florida's Prof. David Reitze, the director of the Laser Interferometer Gravitational-Wave Observatory, said in the news release "This discovery forces us to re-examine our models of how stellar-mass black holes form."

According to CNN, the Chinese team suggested multiple reasons why the black hole is so big, including the suggestion that it could have been formed by the collapse of more than one star.

CNN also noted that other black holes that are larger than LB-1 have been discovered, like supermassive black holes, but that LB-1 is the largest of its kind.

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2019-11-29 12:14:47Z
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Scientists have discovered a 'monster' black hole that's so big it shouldn't exist - CNN

It's a stellar black hole — the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.
This theory has now been toppled by LB-1, the newly-discovered black hole. Located about 15,000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.
The findings were published by Chinese researchers in the journal Nature on Wednesday.
The Milky Way's black hole kicked a star out of our galaxy
"Black holes of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution," said Liu Jifeng, head of the team that made the discovery. "LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation."
Scientists are now scratching their heads at how LB-1 got so huge.
The Chinese team has proposed a number of theories. LB-1's sheer size suggests that it "was not formed from the collapse of only one star," the study said -- instead, it could potentially be two smaller black holes orbiting each other.
Another possibility is that it formed from a "fallback supernova." This is when a supernova -- the last stage of an exploding star -- ejects material during the explosion, which then falls back into the supernova, creating a black hole.
A new type of black hole has been discovered and it may be the smallest ever, astronomers say
This fallback formation is theoretically possible, but scientists have never been able to prove or observe it. If this is how LB-1 formed, then we may have "direct evidence for this process" for the first time, the study said.
LB-1 is not the biggest black hole ever discovered -- but it may be the largest of its kind. There are several types of black holes, and stellar black holes like LB-1 are on the smaller side, according to NASA. Supermassive black holes are much bigger -- they can be billions of times the mass of our sun.
Scientists believe supermassive black holes may be connected to the formation of galaxies, as they often exist at the center of the massive star systems -- but it is still not clear exactly how, or which form first.

Stellar renaissance

Stellar black holes are believed to be commonly scattered across the universe, but they are difficult to detect because they do not normally emit X-rays -- only doing so when they gobble up gas from a star that has ventured close enough. They are so elusive that scientists have only found, identified, and measured about two dozen stellar black holes, the press release said.
The researchers at the Chinese Academy of Sciences tried a different approach. Instead of looking for X-rays emitted by black holes, the team looked for stars that were orbiting some invisible object, being pulled in by its gravity.
Their efforts paid off -- they soon spotted a giant star eight times heavier than the sun, orbiting around what turned out to be LB-1.
The black hole that helps baby stars grow instead of destroying them
"This discovery forces us to re-examine our models of how stellar-mass black holes form," said David Reitze, a physicist at the University of Florida. In May, Reitze's team made its own breakthrough discovery -- observing the never-before-seen collision of a neutron star and a black hole, which sent out ripples in space and time.
These twin discoveries -- the collision, and now LB-1 -- indicate that scientists are reaching "a renaissance in our understanding of black hole astrophysics," said Reitze in the press release.
There have been several other discoveries over the past year that have added to this renaissance. In October, researchers discovered what they believe to be a new type of black hole, smaller than the other kinds. And earlier this week, astronomers discovered a black hole that is actually helping baby stars grow instead of destroying them.

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2019-11-29 11:04:00Z
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Scientists have discovered a 'monster' black hole that's so big it shouldn't exist - CNN

It's a stellar black hole — the type that forms after stars die, collapse, and explode. Researchers had previously believed that the size limit was no more than 20 times the mass of our sun because as these stars die, they lose most of their mass through explosions that expel matter and gas swept away by stellar winds.
This theory has now been toppled by LB-1, the newly-discovered black hole. Located about 15,000 light years away, it has a mass 70 times greater than our sun, according to a press release from the Chinese Academy of Sciences.
The findings were published by Chinese researchers in the journal Nature on Wednesday.
The Milky Way's black hole kicked a star out of our galaxy
"Black holes of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution," said Liu Jifeng, head of the team that made the discovery. "LB-1 is twice as massive as what we thought possible. Now theorists will have to take up the challenge of explaining its formation."
Scientists are now scratching their heads at how LB-1 got so huge.
The Chinese team has proposed a number of theories. LB-1's sheer size suggests that it "was not formed from the collapse of only one star," the study said -- instead, it could potentially be two smaller black holes orbiting each other.
Another possibility is that it formed from a "fallback supernova." This is when a supernova -- the last stage of an exploding star -- ejects material during the explosion, which then falls back into the supernova, creating a black hole.
A new type of black hole has been discovered and it may be the smallest ever, astronomers say
This fallback formation is theoretically possible, but scientists have never been able to prove or observe it. If this is how LB-1 formed, then we may have "direct evidence for this process" for the first time, the study said.
LB-1 is not the biggest black hole ever discovered -- but it may be the largest of its kind. There are several types of black holes, and stellar black holes like LB-1 are on the smaller side, according to NASA. Supermassive black holes are much bigger -- they can be billions of times the mass of our sun.
Scientists believe supermassive black holes may be connected to the formation of galaxies, as they often exist at the center of the massive star systems -- but it is still not clear exactly how, or which form first.

Stellar renaissance

Stellar black holes are believed to be commonly scattered across the universe, but they are difficult to detect because they do not normally emit X-rays -- only doing so when they gobble up gas from a star that has ventured close enough. They are so elusive that scientists have only found, identified, and measured about two dozen stellar black holes, the press release said.
The researchers at the Chinese Academy of Sciences tried a different approach. Instead of looking for X-rays emitted by black holes, the team looked for stars that were orbiting some invisible object, being pulled in by its gravity.
Their efforts paid off -- they soon spotted a giant star eight times heavier than the sun, orbiting around what turned out to be LB-1.
The black hole that helps baby stars grow instead of destroying them
"This discovery forces us to re-examine our models of how stellar-mass black holes form," said David Reitze, a physicist at the University of Florida. In May, Reitze's team made its own breakthrough discovery -- observing the never-before-seen collision of a neutron star and a black hole, which sent out ripples in space and time.
These twin discoveries -- the collision, and now LB-1 -- indicate that scientists are reaching "a renaissance in our understanding of black hole astrophysics," said Reitze in the press release.
There have been several other discoveries over the past year that have added to this renaissance. In October, researchers discovered what they believe to be a new type of black hole, smaller than the other kinds. And earlier this week, astronomers discovered a black hole that is actually helping baby stars grow instead of destroying them.

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2019-11-29 08:57:00Z
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Kamis, 28 November 2019

Thanksgiving in Space: For Astronauts, It's a Cosmic Friendsgiving! - Space.com

They may be circling hundreds of miles above the United States, but the three American residents of the International Space Station have a plan to celebrate Thanksgiving.

"It's all about the togetherness, but not necessarily the commercialism," said Christina Koch, who is spending nearly a year in space, in a NASA video Monday (Nov. 25). 

"In recent years," she added, "I've come to love 'Friendsgiving', and that's a little like what we're having on board here ... although you can say that we're family, too."

Related: Here's What Astronauts Will Eat for Thanksgiving Today
More:
Thanksgiving Night Sky 2019: See Venus, Jupiter & the Moon Together!

NASA astronauts Jessica Meir (left), Christina Koch (center) and Andrew Morgan will celebrate a "Friendsgiving" in space for the U.S. Thanksgiving holiday on the International Space Station this Nov. 28, 2019. (Image credit: NASA TV)

U.S. astronauts Koch, Jessica Meir and Andrew Morgan are just half of the population in space right now, forging strong bonds through recent tasks such as ongoing complicated repairs of a dark-matter experiment and conducting the first all-woman spacewalk

Also on board the space station are two Russians (Aleksandr Skvortsov and Oleg Skripochka) and an Italian (Luca Parmitano). The Americans said they are eager to share the U.S. holiday with their friends, most especially including the food.

"When we think of Thanksgiving, we think of friends, family and food," Morgan said, as his crewmates dug below their floating feet to bring out a cornucopia of space food for the Thanksgiving holiday. The astronauts grabbed the packets out of the air and explained their contents. Among them were vegetables, green beans, macaroni and cheese (just needs water!), cornbread and of course, smoked turkey.

More: NASA's Recipe for Space Corn Bread Dressing

"I want to know who's going to carve the turkey after it comes out of that pouch," Koch joked. The crew may also come up with a way to create their own pumpkin pie out of supplies on board, including cookies, she hinted. (Their full menu will be shared on the NASA website soon.)

Meir, the daughter of American immigrants, recalled Thanksgivings she had as a child: "I grew up in a family with five kids, and as first-generation Americans, I guess my parents had to learn pretty quick how to put on a great Thanksgiving feast."

As she got older, she added, she "lived in various places" and has enjoyed Thanksgiving with "adopted families all over the country." 

This year, her Thanksgiving celebration will be literally out of this world.

Follow Chelsea Gohd on Twitter @chelsea_gohd. Follow us on Twitter @Spacedotcom and on Facebook.

All About Space Holiday 2019

Need more space? Subscribe to our sister title "All About Space" Magazine for the latest amazing news from the final frontier! (Image credit: All About Space)

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2019-11-28 12:38:00Z
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Astronomers discover huge 'black hole' in Milky Way - Al Jazeera English

Astronomers have discovered a black hole in the Milky Way so huge that it challenges existing models of how stars evolve, researchers said on Thursday.

LB-1 is 15,000 light-years from Earth and has a mass 70 times greater than the Sun, according to the journal Nature.

More:

The Milky Way is estimated to contain 100 million stellar black holes but LB-1 is twice as massive as anything scientists thought possible, said Liu Jifeng, a National Astronomical Observatory of China professor who led the research.

"Black holes of such mass should not even exist in our galaxy, according to most of the current models of stellar evolution," he added.

Scientists generally believe that there are two types of black holes.

The more common stellar black holes - up to 20 times more massive than the Sun - form when the centre of a very big star collapses in on itself.

Supermassive black holes are at least a million times bigger than the Sun and their origins are uncertain.

But researchers believed that typical stars in the Milky Way shed most of their gas through stellar winds, preventing the emergence of a black hole the size of LB-1, Liu said.

"Now theorists will have to take up the challenge of explaining its formation," he said in a statement.

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2019-11-28 10:41:00Z
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An electron highway headed for methanol - Phys.org

An electron highway headed for methanol
A conception of a new catalyst that converts carbon dioxide and water to methanol — the catalyst uses carbon nanotubes to create a “highway” for electrons. Credit: Hailiang Wang lab

Making methanol just got a lot easier, now that chemists at Yale have opened up a new electron highway.

The discovery, published online Nov. 27 in the journal Nature, finds a novel solution for two chemical tasks: producing methanol—a volatile, that is prized by industry—and removing from the atmosphere. Hailiang Wang, an assistant professor of chemistry at Yale and member of the Energy Sciences Institute at Yale's West Campus, led the research.

Methanol is used in a variety of products, including antifreeze, paint thinners, and glass cleaners. It is also used to produce biodiesel fuel, plastics, plywood, and permanent-press clothing.

Yale researchers developed a catalyst that converts carbon and water into methanol using electricity. It's a type of catalyst called a heterogeneous molecular electrocatalyst—"heterogeneous" because it's a solid catalyst material operating in a liquid electrolyte, and "molecular" because the active site of the catalyst is a .

The distinct structure of the new is the key, Wang said.

He and his team anchored individual molecules of cobalt phthalocyanine (or its derivative) onto the surface of carbon nanotubes, nanometer-sized tubes of rolled up graphene layers. The nanotubes act like a highway for electrons, creating a rapid and continuous delivery of electrons to the catalytic sites for converting carbon dioxide to methanol. It is a six-electron reduction process, the researchers said, meaning that six electrons are injected into one carbon dioxide molecule.

An electron highway headed for methanol
Yueshen Wu (left) and Xu Lu, co-authors of the new study. Credit: Hailiang Wang lab

Prior to this discovery, a more limited delivery of electrons—a two-electron reduction process—meant molecular catalysts were only able to convert carbon dioxide into products such as monoxide.

"Heterogenized molecular catalysts allow our group to do new chemistry and known chemistry in better ways, and this is one example," Wang said.

Yueshen Wu, a graduate student at Yale, is first author of the study. Co-authors are postdoctoral fellow Xu Lu of Yale and associate professor Yongye Liang and graduate student Zhan Jiang of the Southern University of Science and Technology in China.


Explore further

Carbon dioxide to methanol conversion

More information: Yueshen Wu et al. Domino electroreduction of CO2 to methanol on a molecular catalyst, Nature (2019). DOI: 10.1038/s41586-019-1760-8
Provided by Yale University

Citation: An electron highway headed for methanol (2019, November 28) retrieved 28 November 2019 from https://phys.org/news/2019-11-electron-highway-methanol.html

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2019-11-28 09:44:50Z
CAIiEEmwCKwrBznZzj51M2XOKb0qFwgEKg8IACoHCAowpbDpAzCm_hwwj9kp

NASA panic: Shock interstellar object hurtling towards Earth from deep space spotted - Express.co.uk

Known as 21/Borisov experts say that the object is only the second interstellar object spotted in our solar system. The first close up of the object was captured in August by experts at the Keck observatory in Hawaii. Borisov is now set to make its close approach next month passing roughly 190 million miles away from our orbit, about twice the distance from Earth to the Sun.

The object itself has a long tail made up of ice and debris stretching a whopping 100,000 miles behind it.

With the tale included this makes the Borisov vastly huge staggeringly longer than 12 earths.

"It's humbling to realise how small Earth is next to this visitor from another solar system," said Yale scientist Dr Pieter van Dokkum.

Spotting Borisov well in advance has allowed scientists to study the object extensively before it shoots off once again into deep space.

"Comet Borisov will eventually leave our Solar System," University of California astronomer Dr Paul Kalas wrote last month.

"Until then we should all enjoy the marvellous beauty of our alien comet friend."

Despite the extensive study and focus given to the interstellar object scientists still remain clueless as to what Borisov actually is.

At the moment many scientists best guess is that it is a comet, with the hope being that studying it will open the door to answers on how comets are formed in deep space.

JUST IN: NASA photos reveal storms on Mars create 50 MILE dust towers

Further down, the planet turns towards muddied hues of green, blue and violet before ending in a deep purple colour around the south pole.

But why is the Ringed Giant painted in these unusual colours?

The incredible palette is the result of NASA’s Hubble looking at Saturn in infrared wavelengths of light.

The colours shift in hue with changes in the atmosphere’s density and composition.

For instance, the dark purple at the South Pole suggests a big hole has opened in the atmosphere.

The lighter red and orange colours, on the other hand, indicate a haze above Saturn’s cloud coverage.

NASA said: “The blue colours indicate a clear atmosphere down to a main cloud layer.

“Different shadings of blue indicate variations in the cloud particles, in size or chemical composition.

“The cloud particles are believed to be ammonia ice crystals.”

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2019-11-28 04:03:00Z
52780449378662

Rabu, 27 November 2019

Active Shooter Drills May Not Stop A School Shooting — But This Method Could - NPR

Molly Snee for NPR

School shootings like the recent one in Santa Clarita, Calif., have focused the nation's attention on school safety. And schools across the U.S. are wrestling with how to prevent themselves from becoming the site of the next tragedy.

Many schools are turning to highly visible "hardened" security measures. For example, at least eight states now have laws mandating active shooter drills in schools. But there's little research yet that shows that those drills are effective. Meanwhile, a new comprehensive report from the U.S. Secret Service underlines the agency's previous findings that there is one safety approach that does work: threat assessment, as part of a comprehensive program of social and emotional support for students.

Active shooter drills can scare vulnerable children

A new law in Illinois requires students to participate in active shooter drills at school. The drills often involve students hiding in the classroom and sometimes evacuating the school. Some parents welcome the preparation.

"I don't see any way that the drill can do more harm than if your child was caught up in a real situation and did not know what to do," says Ronick Frazier, who has two daughters in Champaign, Ill., schools.

Another Champaign parent, Dianne, says she has seen the harm these drills can do. Her daughter Rory, 7, is on the autism spectrum and has attention deficit hyperactivity disorder. (We aren't using Dianne's full name to protect her daughter's privacy.)

In the spring, Rory's school had a "hard lockdown drill" in which students were told to stay in their classroom, remain silent and keep calm. Dianne says Rory came home upset and worried about bad guys with guns.

Classroom chairs.
Molly Snee for NPR

"It was heartbreaking. She was screaming and yelling. She loves school, and she kept yelling, 'I don't want to go back. I don't want to go back.' " After seeing Rory's reaction, Dianne says she doesn't think any kids should have to participate in drills like these.

"Fair enough," says Melissa Brymer of the National Center for Child Traumatic Stress. "But an emergency can happen at any point in a school day."

Brymer believes these drills can save lives, but as one recent study from Ball State University found, there's little evidence to prove that.

The study says that's partly because these incidents are so rare that there aren't enough examples for social scientists to find reliable patterns in.

Child psychiatrist Steven Schlozman says researchers have collected anecdotal evidence showing that these drills can be challenging for kids with anxiety and developmental disorders, like Rory.

"Despite people being supercareful to make this a more palatable exercise for them, they still get pretty, you know, at best unnerved and at worst pretty traumatized," Schlozman says.

Schools with lockdowns still have shootings

Meanwhile, the recent Secret Service report has shed new light on security measures such as active shooter drills.

The investigators combed databases for as many incidents as they could find in which a current or recently former student brought a weapon to a K-12 school and harmed someone. They excluded drug- or gang-related incidents. They identified 41 targeted school attacks from 2008 to 2017.

According to the report, 83% of the attacks were over in five minutes or less. And 68% of the schools already had a lockdown procedure in place — making it the most common security measure among schools in the report. Of course, that doesn't necessarily mean a lockdown didn't limit the scope of an attack.

It's also worth noting, since much of the concern over lockdown drills looks at their impact on the youngest children, that only one of the targeted attacks in the report took place at an elementary school.

The report's lead author, Lina Alathari, says rather than focusing solely on what happens after an attack begins, schools need a much more comprehensive approach, emphasizing "multidisciplinary" prevention in the years, months and days before a student actually shows up at school with a weapon. That means bringing together teachers, administrators and mental health professionals, along with law enforcement if needed.

That may be surprising coming from an agency known for its metal detector sweeps and guys with the earpieces. But Alathari says the bulk of what the Secret Service does involves prevention and threat assessment.

She defines threat assessment as a proactive approach in which schools "identify students who are doing concerning behavior or may be in distress and getting them the help they need before they even resort to violence as an option."

Teacher opens the door.
Molly Snee for NPR

One common source of distress, according to the report, is bullying and ostracism. Four out of five of these attackers were bullied at school, and in most cases the bullying was severe and took place over a long time period. Attackers were much more likely to be victims than perpetrators of bullying, although that was fairly common as well.

In the aftermath of the Columbine attack in 1999, in which two Colorado students killed 13 people at their high school and injured more than 20 others before taking their own lives, the Secret Service published its first review of similar incidents. Back then, 71% of attackers had been bullied. Since then, Alathari says, "it's interesting": Despite two decades of anti-bullying legislation, anti-bullying assemblies and anti-bullying curricula in schools, today the incidence is even higher.

"Assess the climate of your school," she says to school leaders. "What is the perception of bullying? What kind of intervention is taking place?"

Alathari says there is some evidence that a better school climate can directly save lives.

Alathari found that 9 out of 10 attackers give a warning sign in the form of concerning or threatening statements. The report includes anecdotes of such warnings, including this one:

[He] tweeted, "It won't last...It'll never last" and texted his ex-girlfriend asking her to meet after school so he could say goodbye. He also sent her a Facebook message that said, "read my messages tomorrow from 7:15 to 12:30." The attacker posted on Instagram, "Tell my mom I love her," and included an emoji image of a gun."

Those messages came from a 15-year-old student who fatally shot four of his classmates and injured one other in his high school cafeteria, before killing himself.

But why don't people report these warning signs? Over a decade ago, the Secret Service conducted a small study in which it talked to "bystanders" — students who had heard warnings from a fellow student before a planned attack. In six cases a shooting was prevented, and in a further nine cases a shooting happened.

In the bystander report, students who came forward told investigators they did so because they had a strong relationship with at least one adult at the school and they thought their concerns would be taken seriously. Students who did not come forward said that they thought the school would not take appropriate steps or they would get in trouble themselves.

Like the Ball State study, Alathari emphasizes that targeted attacks of this kind are extremely rare. The new report excluded attacks that seemed to be related to drugs, gang violence or disputes that merely spilled over onto school property. They were left with an average of four shootings or stabbings per year across hundreds of thousands of schools, and the report found no upward trend in the frequency or severity of attacks over time. That's yet another reason, she says, to focus on prevention efforts that can improve the school climate overall — whether or not the worst-case scenario happens one day.

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2019-11-27 12:39:00Z
CAIiEI_1qyfYioYRTwopDKamvskqFggEKg4IACoGCAow9vBNMK3UCDCvpUk

New image offers close-up view of interstellar comet - Phys.org

New image offers close-up view of interstellar comet
Left: A new image of the interstellar comet 2l/Borisov. Right: A composite image of the comet with a photo of the Earth to show scale. Credit: Pieter van Dokkum, Cheng-Han Hsieh, Shany Danieli, Gregory Laughlin

Yale astronomers have taken a new, close-up image of the interstellar comet 2l/Borisov.

2l/Borisov, first spotted this summer, continues to draw nearer to Earth and will reach its —about 190 million miles—in early December. Researchers believe the comet formed in a beyond ours and was ejected into as a consequence of a near-collision with a planet in its original solar system.

Yale astronomers Pieter van Dokkum, Cheng-Han Hsieh, Shany Danieli, and Gregory Laughlin captured the image Nov. 24 using the W.M. Keck Observatory's Low-Resolution Imaging Spectrometer in Hawaii. They've also created an image that shows how the comet would look alongside planet Earth.

According to van Dokkum the comet's tail, shown in the new image, is nearly 100,000 miles long, which is 14 times the size of Earth. "It's humbling to realize how small Earth is next to this visitor from another solar system," van Dokkum said.

Laughlin noted that 2l/Borisov is evaporating as it gets closer to Earth, releasing gas and fine dust in its tail. "Astronomers are taking advantage of Borisov's visit, using telescopes such as Keck to obtain information about the building blocks of planets in systems other than our own," Laughlin said.

The solid nucleus of the comet is only about a mile wide. As it began reacting to the Sun's warming effect, the comet has taken on a "ghostly" appearance, the researchers said.


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Hubble Telescope zooms in on interstellar visitor

Provided by Yale University

Citation: New image offers close-up view of interstellar comet (2019, November 27) retrieved 27 November 2019 from https://phys.org/news/2019-11-image-close-up-view-interstellar-comet.html

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2019-11-27 10:36:59Z
52780449378662

We Have Some Good News About The Life Expectancy of Jupiter's Great Red Spot - ScienceAlert

Despite what you might have heard, Jupiter's Great Red Spot is probably not on the point of total disintegration.

The most powerful storm in our Solar System has been shrinking for at least a hundred years, computational physicist Philip Marcus says, but that doesn't mean it's actually dying.

"I don't think its fortunes were ever bad," says Marcus, who works at the University of California, Berkeley (UC Berkeley).

"It's more like Mark Twain's comment: The reports about its death have been greatly exaggerated."

And really, unless you knew better, it would be hard not to fear the worst. Earlier this year, pictures from both astronomers and amateurs captured Jupiter's iconic storm inexplicably shedding red flakes and streams of gas.

The storm's angry red eye looked as though it was suddenly unravelling, sloughing off large chunks of itself bit by bit. Later, NASA's Juno spacecraft captured similar images, as it flew by the storm's edge.

What was actually going on here remained unclear, even to many experts: While some predicted total disintegration, others were not so sure.

217279 web(Chris Go)

Speaking at an annual meeting for Division of Fluid Dynamics of the American Physical Society, Marcus says talking about the storm's imminent death is premature. Looking over the fluid dynamics of storms on Jupiter, he and his colleagues argue that although the clouds are shrinking, there is no evidence that the storm's hidden vortex is diminishing in size or intensity.

Instead, they say, these are just normal storm dynamics for anticyclones on Jupiter.

Not so long ago, the Great Red Spot was large enough to hold three Earths; now, admittedly, you could only squeeze in one or two. But just because it's smaller, rounder and taller on the outside, doesn't mean this storm is any less powerful at its core.

Using computer simulations, the researchers from UC Berkeley have now shown that surrounding wispy clouds on the boundary of Jupiter's Red Spot can sometimes bump up against other cyclones, spinning in the opposite direction. This, in turn, can cause a collision, which detaches part of the storm and sends it flying.

"It's like having two fire hoses aimed at each other," Marcus told The New York Times.

In all likelihood, he says, this is probably what photographers captured earlier this year. And it's nothing to worry about; it's perfectly natural and healthy for an anticyclone to behave this way.

Unless the jet streams which keep the storm aloft suddenly disappear, Marcus predicts Jupiter's Great Red Spot will continue to survive "for the indefinite future", and probably even longer than that.

"Of course," he admitted at a recent news conference, "I probably just gave it the kiss of death and it'll probably fall apart next week but that's the way science works."

The talk was given at the 72nd Annual Meeting of the American Physical Society Division of Fluid Dynamics.

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2019-11-27 01:07:18Z
52780448274403

Selasa, 26 November 2019

NASA’s Orion space capsule undergoes testing in Sandusky before moon launch - WJW FOX 8 News Cleveland

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  1. NASA’s Orion space capsule undergoes testing in Sandusky before moon launch  WJW FOX 8 News Cleveland
  2. Amazing footage of NASA's 'Super Guppy' aircraft delivering the space agency's Orion spacecraft  Daily Mail
  3. Watch: NASA's Super Guppy Delivers Orion Spacecraft to Ohio Airport  Geek
  4. NASA's Orion Spacecraft now heads to Sandusky  News 5 Cleveland
  5. NASA’s huge & cavernous Super Guppy plane called in to haul SPACECRAFT from Florida to Ohio (PHOTOS, VIDEOS)  RT
  6. View full coverage on Google News

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2019-11-26 11:55:00Z
52780447433878

16-million-year-old fossil shows springtails hitchhiking on winged termite - Phys.org

16-million-year-old fossil shows springtails hitchhiking on winged termite
Distribution of springtails on termite and ant hosts within ~ 16 Ma old Dominican amber. Credit: N. Robin, C. D'Haese and P. Barden

When trying to better the odds for survival, a major dilemma that many animals face is dispersal—being able to pick up and leave to occupy new lands, find fresh resources and mates, and avoid intraspecies competition in times of overpopulation.

For birds, butterflies and other winged creatures, covering long distances may be as easy as the breeze they travel on. But for soil-dwellers of the crawling variety, the hurdle remains: How do they reach new, far-off habitats?

For one group of tiny arthropods called springtails (Collembola), a recent fossil discovery now suggests their answer to this question has been to piggyback on the dispersal abilities of others, literally.

In findings published in BMC Evolutionary Biology, researchers at the New Jersey Institute of Technology (NJIT) and Museum national d'Histoire naturelle have detailed the discovery of an ancient interaction preserved in 16-million-year-old amber from the Dominican Republic: 25 springtails attached to, and nearby, a large winged termite and ant from the days of the early Miocene.

The fossil exhibits a number of springtails still attached to the wings and legs of their hosts, while others are preserved as if gradually floating away from their hosts within the amber. Researchers say the discovery highlights the existence of a new type of hitchhiking behavior among wingless soil-dwelling arthropods, and could be key to explaining how symphypleonan springtails successfully achieved dispersal worldwide.

16-million-year-old fossil shows springtails hitchhiking on winged termite
Distribution of springtails on termite and ant hosts within ~ 16 Ma old Dominican amber, and illustration of location of springtails on social insects. Credit: N. Robin, C. D’Haese and P. Barden

"The existence of this hitchhiking behavior is especially exciting given the fact that modern springtails are rarely described as having any interspecfic association with surrounding animals," said Ninon Robin, the paper's first author whose postdoctoral research at NJIT's Department of Biological Sciences was funded by the Fulbright Program of the French-American Commission. "This finding underscores how important fossils are for telling us about unsuspected ancient ecologies as well as still ongoing behaviors that were so far simply overlooked."

Today, springtails are among the most common arthropods found in moist habitats around the world. Most springtails possess a specialized appendage under their abdomen they use to "spring" away in flee-like fashion to avoid predation. However this organ is not sufficient for traversing long distances, especially since most springtails are unable to survive long in dry areas.

The hitchhikers the researchers identified belong to a lineage of springtails found today on every continent, known as Symphypleona,which they say may have been "pre-adapted" to grasping on to other arthropods through prehensile antennae.

Because springtails would have encountered such winged termites and ants frequently due to their high abundance during the time of the preservation, these may have been their preferred hosts for transportation.

16-million-year-old fossil shows springtails hitchhiking on winged termite
Allacma fusca is a species belonging to one of the three main groups of springtails today known as Symphypleona. Credit: Urmas Tartes/Wikipedia

"Symphypleonan springtails are unusual compared to other Collembola in that they have specialized antennae that are used in mating courtship," said Phillip Barden, assistant professor of biology at NJIT and the study's principal investigator. "This antennal anatomy may have provided an evolutionary pathway for grasping onto other arthropods. In this particular fossil, we see these specialized antennae wrapping around the wings and legs of both an ant and termite. Some winged ants and termites are known to travel significant distances, which would greatly aid in dispersal."

Barden says that the discovery joins other reports from the Caribbean and Europe of fossil springtails attached to a beetle, a mayfly and a harvestman in amber, which together suggest that this behavior may still exist today.

Barden notes that evidence of springtail hitchhiking may not have been captured in such high numbers until now due to the rarity of such a fossilized interaction, as well as the nature of modern sampling methods for insects, which typically involves submersion in ethanol for preservation.

"Because it appears that springtails reflexively detach from their hosts when in danger, evidenced by the detached individuals in the amber, ethanol would effectively erase the link between hitchhiker and host," said Barden. "Amber derives from fossilized sticky tree resin and is viscous enough that it would retain the interaction. ... Meaning, sometimes you have to turn to 16-million-year-old amber fossils to find out what might be happening in your backyard."


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Specialized beetles shed light on predator-prey associations in the cretaceous

More information: Ninon Robin et al, Fossil amber reveals springtails' longstanding dispersal by social insects, BMC Evolutionary Biology (2019). DOI: 10.1186/s12862-019-1529-6

Citation: 16-million-year-old fossil shows springtails hitchhiking on winged termite (2019, November 26) retrieved 26 November 2019 from https://phys.org/news/2019-11-million-year-old-fossil-springtails-hitchhiking-winged.html

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2019-11-26 08:12:48Z
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