Kamis, 28 November 2019

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.

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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.


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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
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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
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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.


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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

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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2019-11-27 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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