Connect with us

Science

16 Psyche: Hubble reveals more about asteroid thought to be worth more than global economy – CTV News

Published

 on


TORONTO —
New images from the Hubble Space Telescope have given scientists a closer look at one of the largest and most intriguing asteroids floating around the solar system – one that is thought to consist of metal estimated to be worth more than the entire global economy.

The gigantic asteroid, called 16 Psyche, is approximately 225 kilometres in diameter and orbits between Jupiter and Mars in the main asteroid belt. It’s of particular interest to scientists because, unlike most other asteroids that are rocky or icy, this one appears to be largely made up of metallic iron and nickel.

According to NASA, 16 Psyche may be the exposed core of an early planet – possibly as large as Mars – that lost its outer layers in violent collisions billions of years ago.

“Through some exciting collisions in its past, the mantle and the crust were stripped away, leaving bare this exposed, metallic core,” Tracy Becker, who led the study to examine the asteroid with the Hubble Space Telescope, told CTVNews.ca.

Becker, a planetary scientist at the Southwest Research Institute in Texas, said that 16 Psyche might have been a protoplanet – a planet that has not yet fully formed – and that by studying it, scientists might be able to learn more about the Earth’s own core.

“If we can study the asteroid, we could potentially learn a little bit about Earth in the sense of having direct access to a planetary core, which we can never do here on Earth is see our own core,” she explained in a telephone interview on Thursday.

While astronomers have known about 16 Psyche’s existence for some years, they had never taken such a close look at it until Becker and her team used the Hubble Space Telescope to observe its surface at ultraviolet (UV) wavelengths.

“The way it reflects light in ultraviolet could tell us, potentially, about its metal content and any other materials that we might see on the surface,” Becker said.

The scientists studied 16 Psyche at two specific points in its rotation in order to view both sides of the asteroid in great detail.

Becker says the telescope scans led to two major findings that were published in The Planetary Science Journal this week.

 The first was observing UV light reflecting off 16 Psyche in similar way to how it’s reflected off metallic meteorites or a slab of iron.

“We confirmed that in the UV, it does look like it has metal on the surface,” she said.

However, their second observation called into question just how much metal is actually there. Based on their computer modelling, Becker said they determined that even a small presence of iron could dominate their UV observations.

“You can imagine, just like sprinkling a little bit of iron with other materials, and it would look very kind of iron-like in the way it reflected,” she said. “It doesn’t mean that it isn’t 100 per cent iron, it just means it could be as little as only 10 per cent.”

Despite this inconclusive data, Becker said they discovered that the asteroid actually brightened when they looked at it at deeper UV wavelengths. She said this could be an indication of some sort of “processing” on its surface from solar weathering.

“When we’ve seen this brightening in the deep UV before, it’s indicated to us that it could be processing due to things like the solar wind, which are just the charged particles coming from the sun and hitting that surface over the millions or even billions of years that it may have been exposed for,” she said.

While further research is needed, Becker said the processing could provide insight into the age and formation of the asteroid.

Becker said they conducted the study in order to get a better picture of 16 Psyche before NASA sends an unmanned spacecraft on a SpaceX Falcon Heavy rocket to study the asteroid in 2022.

According to NASA, the “mission’s goal is, among other things, to determine whether Psyche is indeed the core of a planet-size object.”  

Becker said she’s excited to see what the mission uncovers because if 16 Psyche is, indeed, a “big piece of metal,” they’re going to learn a lot about the Earth’s core and how the core of all planets in the solar system are formed.

“Even if it turns out that it’s not very in high metal content and it is a little bit more rocky than initially thought, it’s still going to tell us a lot about how these kinds of objects can form in the solar system and how they’ve changed, how they evolved, and how they’ve had collisions and things like that,” she said.

The asteroid’s composition has been a subject of great curiosity among scientists who even estimated its iron contents could be worth $10,000 quadrillion back in 2017. That’s such a big number it’s hard to conceive, but suffice to say it’s substantially larger than the $90 trillion worth of the global economy in 2019.

No matter its worth, Becker said we don’t have the technology to even think about a mission to bring pieces of it back to Earth.

“I think it would cost probably more to get there and get a piece and bring it back then than a small piece might be worth,” she said with a laugh.

“For me, the worth is really in the science that we can get out of studying it.” 

Let’s block ads! (Why?)



Source link

Continue Reading

Science

Farrell calls for consideration of city bylaw to stop street harassment in Calgary – Calgary Herald

Published

 on


Article content continued

Some other Canadian cities have rules to deal with street harassment. In London, Ont., you can be fined for using “abusive or insulting language” in a public space.

Street harassment takes many forms, from unwanted sexual comments to whistling to flashing or groping, and it’s based on someone’s perceived gender or sexual identity. It’s a point of focus for gender equity advocates, as an example of how control tactics make people feel unsafe in public spaces.

Sagesse executive director Andrea Silverstone said Monday that street harassment can’t be dismissed as one-off comments or isolated incidents.

“It’s a structured pattern of behaviour that occurs in society that makes certain people feel unsafe,” she said. “Whether they’re women or 2SLGBTQ individuals or visible minorities feeling unsafe on the street.”

Jake Stika, executive director of Next Gen Men, said street harassment is a symptom of how boys absorb the message that being a man is about power and dominance, and they start defining their interactions that way.

Street harassment, he explains, is overwhelmingly perpetuated by men, but men are also key to stopping it.

“It’s not a women’s issue. Women are impacted by it … but what we need to do as guys is take this up as our issue,” he said. “We’re the problem, but we’re also the solution.”

Stika’s organization works to redefine manhood and masculinity with youth and community programs as part of working “upstream” to stop gender-based violence and improve men’s health and relationships.

Let’s block ads! (Why?)



Source link

Continue Reading

Science

AI Solves 50-Year-Old Biology 'Grand Challenge' Decades Before Experts Predicted – ScienceAlert

Published

 on


A long-standing and incredibly complex scientific problem concerning the structure and behaviour of proteins has been effectively solved by a new artificial intelligence (AI) system, scientists report.

DeepMind, the UK-based AI company, has wowed us for years with its parade of ever-advancing neural networks that continually trounce humans at complex games such as chess and Go.

All those incremental advancements were about much more than mastering recreational diversions, however.

In the background, DeepMind’s researchers were seeking to coax their AIs towards solving much more fundamentally important scientific puzzles – such as finding new ways to fight disease by predicting infinitesimal but vitally important aspects of human biology.

Now, with the latest version of their AlphaFold AI engine, they seem to have actually achieved this very ambitious goal – or at least gotten us closer than scientists ever have before.

[embedded content]

For about 50 years, researchers have strived to predict how proteins achieve their three-dimensional structure, and it’s not an easy problem to solve.

The astronomical number of potential configurations is so mind-bogglingly huge, in fact, that researchers postulated it would take longer than the age of the Universe to sample all the possible molecular arrangements.

Nonetheless, if we can solve this puzzle – known as the protein-folding problem – it would constitute a giant breakthrough in scientific capabilities, vastly accelerating research endeavours in things like drug discovery and modelling disease, and also leading to new applications far beyond health.

For that reason, despite the scale of the challenge, for decades researchers have been collaborating to make gains in developing solutions to the protein-folding problem.

A rigorous experiment called CASP (Critical Assessment of protein Structure Prediction) began in the 1990s, challenging scientists to devise systems capable of predicting the esoteric enigmas of protein folding.

[embedded content]

Now, in its third decade, the CASP experiment looks to have produced its most promising solution yet – with DeepMind’s AlphaFold delivering predictions of 3D protein structures with unprecedented accuracy.

“We have been stuck on this one problem – how do proteins fold up – for nearly 50 years,” says CASP co-founder John Moult from the University of Maryland.

“To see DeepMind produce a solution for this, having worked personally on this problem for so long and after so many stops and starts wondering if we’d ever get there, is a very special moment.”

In the experiment, DeepMind used a new deep learning architecture for AlphaFold that was able to interpret and compute the ‘spatial graph’ of 3D proteins, predicting the molecular structure underpinning their folded configuration.

The system, which was trained up by analysing a databank of approximately 170,000 protein structures, brought its unique skillset to this year’s CASP challenge, called CASP14, achieving a median score in its predictions of 92.4 GDT (Global Distance Test).

That’s above the ~90 GDT threshold that’s generally considered to be competitive with the same results obtained via experimental methods, and DeepMind says its predictions are only off by about 1.6 angstroms on average (about the width of an atom).

“I nearly fell off my chair when I saw these results,” says genomics researcher Ewan Birney from the European Molecular Biology Laboratory.

“I know how rigorous CASP is – it basically ensures that computational modelling must perform on the challenging task of ab initio protein folding. It was humbling to see that these models could do that so accurately. There will be many aspects to understand but this is a huge advance for science.”

It’s worth noting that the research has not yet been peer-reviewed, nor published in a scientific journal (although DeepMind’s researchers say that’s on the way).

Even so, experts who are familiar with the field are already recognising and applauding the breakthrough, even if the full report and detailed results are yet to be seen.

“This computational work represents a stunning advance on the protein-folding problem, a 50-year old grand challenge in biology,” says structural biologist Venki Ramakrishnan, president of the Royal Society.

“It has occurred decades before many people in the field would have predicted.”

The full findings are not yet published, but you can see the abstract for the research, “High Accuracy Protein Structure Prediction Using Deep Learning”, here, and find more information on CASP14 here.

Let’s block ads! (Why?)



Source link

Continue Reading

Science

A 'Beaver Full Moon' With Lunar Eclipse Happened This Morning—And Folks Took Some Stunning Photos – Good News Network

Published

 on


If you were up in the early hours of this morning, you may have noticed the full moon turning a shade or so darker and redder.

Thomas Lipke

What you were seeing is called a penumbral lunar eclipse. Caused by the moon dipping behind the Earth’s fuzzy penumbra, or outer shadow, this subtle shading effect peaked at 4:32 am ET November 30, when—according to NASA—83% of the moon was in the shadow of our planet.

NASA has also given a list of the names November’s full moon is known by: The Algonquin tribes have long called this the Cold Moon after the long, frozen nights. Others know it as the Frost Moon, while an Old European Name is Oak Moon: perhaps because of ancient Druid traditions that involve harvesting mistletoe from oak trees for the upcoming winter solstice.

In America, the November full moon is perhaps still best known as the Beaver Moon—with Native Americans associating it with a time when the beavers are scrabbling to finish building their dens from mud and sticks and rocks in preparation for winter.

While this was the last penumbral eclipse of the year, don’t worry if you missed the occurrence due to sleep or clouds.

For those who didn’t get to witness the phenomenon in person, from San Francisco to Michigan to the Sydney Opera House, here are some stunning pictures of this year’s last partial lunar eclipse.

RELATED: With Every Planet Visible This Week and Leonid Meteor Shower Shooting Fireballs, It’s Time to Get Out the Telescope

P.S. The next full moon will be the Cold Christmas Moon on December 29, 2020.

The full moon captured with the San Francisco skyline view at Alameda

A peaceful scene from Mackinac Island in Michigan

Surreal views from Joshua Tree

The Columbia River Gorge became a moonrise kingdom

Cool blue views were taken by this photographer in Northumberland, England

This photographer in Russia caught an image straight from a folk tale

Clouds added interest and atmosphere to these photos taken in Preston, England

A calming moment was captured on Rhode Island

The moon united photographers everywhere last night. Here’s a view from Sydney.

SHARE These Far-Out Views With Friends on Social Media…

Let’s block ads! (Why?)



Source link

Continue Reading

Trending