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. Scientists spot black hole so huge it 'shouldn't even exist' in our galaxy  Rappler
  3. Massive black hole that 'should not even exist' has been discovered  Yahoo News
  4. Black hole discovery: How an 'impossibly' heavy black hole will 'update astronomy books'  Express.co.uk
  5. Scientists find ‘monster’ black hole so big they didn’t think it was possible  The Washington Post
  6. View full coverage on Google News

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2019-11-30 12:00:00Z
52780451885630

Jumat, 29 November 2019

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

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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 releaseL "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
52780451885630

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
52780449746865

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
52780450514629

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

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

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


Explore further

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
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Astronomers Reveal Stunning New Image of The Interstellar Comet Coming Towards Us - ScienceAlert

We spotted it in August: a mysterious object shooting through our Solar System on a strange, hyperbolic trajectory implying that, whatever this thing was, it wasn't from around here.

Subsequent analysis confirmed this visitor from deep space, now designated 2I/Borisov, was only the second interstellar object ever detected in our Solar System (and the first comet). And we just got a brand-new close-up of it.

A team of astronomers from Yale University captured this stunning image of 2I/Borisov on Sunday, using the W.M. Keck Observatory's Low-Resolution Imaging Spectrometer in Hawaii.

011 2I borisov close up 22I/Borisov. (Pieter van Dokkum, Cheng-Han Hsieh, Shany Danieli, Gregory Laughlin)

That white ghostly shroud surrounding the icy comet – which is currently drawing nearer to Earth – is called a coma: a cloud of gas and dust that drift into space as the object's icy nucleus sublimates in the heat of starlight.

In the case of 2I/Borisov, much of this outgassed matter trails behind the comet in an epic tail that currently measures almost 100,000 miles long – over a dozen Earth diameters in a row.

"It's humbling to realise how small Earth is next to this visitor from another solar system," says one of the Yale team, Pieter van Dokkum.

2I/Borisov is projected to reach its closest approach to the Sun in early December, and to Earth later in the month – after which it will continue on its way out of our cosmic neighbourhood, taking what remains of its icy mystery with it to whichever distant stars beckon next.

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2019-11-27 05:43:15Z
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Selasa, 26 November 2019

NASA's Orion Capsule Takes a Ride on the 'Super Guppy' (Photos, Video) - Space.com

NASA's Orion spacecraft just took a ride on one of the weirdest airplanes in the world.

Orion, which will help astronauts get to and from the moon and Mars, flew from Florida's Kennedy Space Center (KSC) to Ohio over the weekend aboard the Super Guppy, NASA's specialized oversized-transport plane.  

The Super Guppy touched down at Mansfield Lahm Airport on Sunday (Nov. 24). Orion was removed from the plane and loaded onto a flatbed truck on Monday morning (Nov. 25), NASA officials said. The capsule is headed for NASA's Plum Brook Station, where it will undergo extensive testing inside the world's largest vacuum chamber.

Related: The Orion Space Capsule: NASA's Next Spaceship (Photos)

The testing campaign will begin with a "thermal test," during which Orion's various systems will be powered on in a space-like environment.

"During this phase, the spacecraft will be subjected to extreme temperatures, ranging from minus 250 to 300 degrees Fahrenheit [minus 160 to 150 degrees Celsius], to replicate flying in and out of sunlight and shadow in space," NASA officials wrote in a statement. "The second phase is an electromagnetic interference and compatibility test, lasting about 14 days. This testing will ensure the spacecraft’s electronics work properly when operated at the same time."

After these tests are done, Orion will be ferried back to KSC, where technicians will begin integrating it with NASA's huge Space Launch System (SLS) rocket ahead of the Artemis 1 mission. 

Artemis 1, which is targeted for November 2020, will send Orion on a three-week, uncrewed flight around the moon. That mission will be the first for the SLS and the second for Orion, which took a brief uncrewed jaunt to Earth orbit in December 2014. (That flight lifted off atop a United Launch Alliance Delta IV Heavy rocket.)

Artemis 1 will be a key milestone in NASA's Artemis program, which aims to put two astronauts down near the lunar south pole by 2024 and establish a long-term, sustainable human presence on and around the moon by 2028.

Accomplishing such goals will help NASA and its partners learn the skills needed to put boots on Mars, agency officials have said.

Image 1 of 12

NASA Administrator Jim Bridenstine posted this photo on Twitter on Nov. 25, 2019, along with the following words: "Ohio welcomes NASA's Super Guppy carrying our newest Moon capsule! @NASA_Orion will be tested @NASAglenn's Plum Brook Station. The Orion spacecraft will launch on the #Artemis 1 mission and will travel 280,000 miles from Earth, thousands of miles beyond the Moon!"

NASA Administrator Jim Bridenstine posted this photo on Twitter on Nov. 25, 2019, along with the following words: "Ohio welcomes NASA's Super Guppy carrying our newest Moon capsule! @NASA_Orion will be tested @NASAglenn's Plum Brook Station. The Orion spacecraft will launch on the #Artemis 1 mission and will travel 280,000 miles from Earth, thousands of miles beyond the Moon!" (Image credit: NASA/Jim Bridenstine via Twitter)

NASA Administrator Jim Bridenstine posted this photo on Twitter on Nov. 25, 2019, along with the following words: "Ohio welcomes NASA's Super Guppy carrying our newest Moon capsule! @NASA_Orion will be tested @NASAglenn's Plum Brook Station. The Orion spacecraft will launch on the #Artemis 1 mission and will travel 280,000 miles from Earth, thousands of miles beyond the Moon!" 

Image 2 of 12

NASA's Super Guppy transport plane waits to ferry the Orion capsule from Florida to Plum Brook Station in Ohio for testing.

NASA's Super Guppy transport plane waits to ferry the Orion capsule from Florida to Plum Brook Station in Ohio for testing. (Image credit: Kim Shiflett/NASA)

NASA's Super Guppy transport plane waits to ferry the Orion capsule from Florida to Plum Brook Station in Ohio for testing. 

Image 3 of 12

NASA's Orion capsule, wrapped up for transport, is guided toward the Super Guppy.

NASA's Orion capsule, wrapped up for transport, is guided toward the Super Guppy. (Image credit: NASA/Jim Bridenstine via Twitter)

NASA's Orion capsule, wrapped up for transport, is guided toward the Super Guppy.

Image 4 of 12

Super Guppy opens wide for Orion.

Super Guppy opens wide for Orion. (Image credit: Kim Shiflett/NASA)

Super Guppy opens wide for Orion.

Image 5 of 12

Super Guppy was designed to handle oversized loads such as Orion.

Super Guppy was designed to handle oversized loads such as Orion. (Image credit: Kim Shiflett/NASA)

Super Guppy was designed to handle oversized loads such as Orion.

Image 6 of 12

The transport plane has been flying NASA cargo for more than five decades.

The transport plane has been flying NASA cargo for more than five decades. (Image credit: NASA/Jim Bridenstine via Twitter)

The transport plane has been flying NASA cargo for more than five decades.

Image 7 of 12

This Orion capsule will fly Artemis 1, an uncrewed mission around the moon that's scheduled to launch in late 2020.

This Orion capsule will fly Artemis 1, an uncrewed mission around the moon that's scheduled to launch in late 2020. (Image credit: Kim Shiflett/NASA)

This Orion capsule will fly Artemis 1, an uncrewed mission around the moon that's scheduled to launch in late 2020.

Image 8 of 12

The Super Guppy's cargo area is 111 feet long by 25 feet wide (34 by 7.6 meters).

The Super Guppy's cargo area is 111 feet long by 25 feet wide (34 by 7.6 meters). (Image credit: Kim Shiflett/NASA)

The Super Guppy's cargo area is 111 feet long by 25 feet wide (34 by 7.6 meters).

Image 9 of 12

Orion slides right in.

Orion slides right in. (Image credit: Kim Shiflett/NASA)

Orion slides right in.

Image 10 of 12

Another view.

Another view. (Image credit: Kim Shiflett/NASA)

Another view.

Image 11 of 12

Room to spare!

Room to spare! (Image credit: NASA/Jim Bridenstine via Twitter)

Room to spare!

Image 12 of 12

At Plum Brook Station, Orion will undergo extensive testing inside the world's largest vacuum chamber, showing how the capsule performs in a space-like environment.

At Plum Brook Station, Orion will undergo extensive testing inside the world's largest vacuum chamber, showing how the capsule performs in a space-like environment. (Image credit: Kim Shiflett/NASA)

At Plum Brook Station, Orion will undergo extensive testing inside the world's largest vacuum chamber, showing how the capsule performs in a space-like environment.

The Super Guppy has been hauling oversized NASA cargo for more than five decades. The plane's strange, bulbous shape makes perfect sense, given this role.

"Although there are other aircraft capable of carrying more weight than the Super Guppy, very few come close to its internal dimensions. Boasting an immense cargo area that is 25 feet in diameter and 111 feet long [7.6 by 34 meters], the Super Guppy can carry items that are virtually impossible to fit inside other cargo aircraft," NASA officials wrote in a description of the aircraft.

"The Super Guppy has a unique hinged nose that opens 110 degrees, permitting full frontal cargo loading," they added. "A control lock and disconnect system at the fuselage break allows the nose to be opened and closed without disrupting the flight or engine control rigging."

Mike Wall's book about the search for alien life, "Out There" (Grand Central Publishing, 2018; illustrated by Karl Tate), is out now. Follow him on Twitter @michaeldwall. Follow us on Twitter @Spacedotcom or Facebook

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2019-11-26 12:04:00Z
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