Space Thread

[spaminator]

Scientists get a rare peek inside of an exploding star
Author of the article:Associated Press
Associated Press
Adithi Ramakrishnan
Published Aug 20, 2025 • Last updated 16 hours ago • 1 minute read

This illustration provided by W.M. Keck Observatory depicts the insides of an exploding star.
This illustration provided by W.M. Keck Observatory depicts the insides of an exploding star. Photo by Adam Makarenko/W. M. Keck Observatory via AP
NEW YORK — Scientists for the first time have spotted the insides of a dying star as it exploded, offering a rare peek into stellar evolution.


Stars can live for millions to trillions of years until they run out of fuel. The most massive ones go out with a bang in an explosion called a supernova.


Using telescopes that peer deep into space, researchers have observed many such explosions. The cosmic outbursts tend to jumble up a dying star’s layers, making it hard for scientists to observe the inner structure.

But that wasn’t the case for the new discovery, a supernova called 2021yfj located in our Milky Way galaxy.

The collapsing star’s outermost layers of hydrogen and helium had peeled away long ago, which wasn’t surprising. But the star’s dense, innermost layers of silicon and sulfur had also shed during the explosion.

“We have never observed a star that was stripped to this amount,” said Northwestern University’s Steve Schulze, who was part of the discovery team that published the research Wednesday in the journal Nature.


The finding lends evidence to ideas scientists have about how large stars look near the end of their lives, organized into layers with lighter elements on the outside and heavier ones close to the core.

“Because so many of the layers had been stripped off this star, this basically confirmed what those layers were,” said Anya Nugent, who studies supernovas at the Harvard-Smithsonian Center for Astrophysics. She was not involved with the new research.

It’s not yet clear how this star got so whittled down _ whether its layers were flung off violently in the final stages of its life or yanked away by a twin star. Future research may yield clues, though scientists acknowledged such an event may be tough to capture again.

Scientists get a rare peek inside of an exploding star

Scientists for the first time have spotted the insides of a dying star as it exploded, offering a rare peek into stellar evolution.

torontosun.com

 

[Ron in Regina]

Why the Space Force broke with tradition to announce the X-37B’s activities mid-mission remains unclear (such disclosures usually come after the plane is back on the ground, or the Presidential bathroom on Truth Social at 3am).

A top secret US spacecraft takes flight tonight – and it could rewrite the rules of future warfare — BBC Science Focus Magazine

The X-37B returned to Earth this month, but details of its time in space remain hazy, to say the least. August 21, 2025 Later today, in the dead of night, a mysterious spacecraft is set to launch from NASA’s Kennedy Space Center in Florida. The craft in question is the eerily-named X-37B – an...

apple.news

 

[spaminator]

Scientists are baffled by a powerful and long-lasting gamma ray explosion outside our galaxy
Author of the article:Associated Press
Associated Press
Marcia Dunn
Published Sep 09, 2025 • 1 minute read

090925-Gamma_Ray_Explosion
This image provided by the European Southern Observatory shows a powerful explosion, orange dot at the center of the image, that repeated several times over the course of a day, The image, taken with ESO's Very Large Telescope (VLT), allowed astronomers to determine that the explosion didn't take place in the Milky Way but in another galaxy. (European Southern Observatory via AP) AP
CAPE CANAVERAL, Fla. (AP) — Scientists have discovered a gamma ray explosion outside our galaxy that’s not only exceptionally powerful, but also long-lasting.


Telescopes on Earth and in space — including Hubble — have teamed up to study the unique explosion of high-energy radiation first observed in July. Astronomers reported Tuesday it’s unlike anything they’ve witnessed before.


The repeated bursts of gamma rays were detected over the course of a day, according to scientists. That’s highly unusual since these kinds of bursts normally last just minutes or even milliseconds — rarely no more than a few hours — as dying stars collapse or are torn apart by black holes.

Scientists said such a long and recurrent gamma ray explosion is puzzling — a cosmic whodunit, at least for now. More observations are needed to confirm its precise whereabouts.

The European-led team announced its findings in the Astrophysical Journal Letters in August.

Scientists are baffled by a powerful and long-lasting gamma ray explosion outside our galaxy

Scientists said such a long and recurrent gamma ray explosion is puzzling -- a cosmic whodunit, at least for now.

torontosun.com

 

[Tecumsehsbones]

Probably the Jews.

 

[spaminator]

Gravitational waves from black hole smash confirm Hawking theory
Author of the article:AFP
AFP
by Frédéric BOURIGAULT
Published Sep 10, 2025 • 3 minute read

An artist's illustration of two black holes merging. Photo by N. Fischer, H. Pfeiffer, A. Buonanno /MAX PLANCK INSTISTUTE FOR GRAVITATIONAL PHYSICS/AFP/File
Paris (AFP) — Ripples in spacetime sent hurtling through the universe when two black holes smash into each other — a phenomenon predicted by Albert Einstein — have confirmed a theory proposed by fellow physicist Stephen Hawking over 50 years ago, scientists announced Wednesday.


These ripples, which are called gravitational waves, were detected for the first time in 2015 by the Laser Interferometer Gravitational-Wave Observatory (LIGO) in the United States.


In his 1916 theory of general relativity, Einstein predicted that the cataclysmic merger of two black holes would produce gravitational waves that would ripple across the universe and eventually arrive at Earth.

On January 14 this year, LIGO detected another of these signals from the distant universe.

That is no longer such a surprise.

Scientists in the LVK collaboration — a vast network of scientists whose facilities includes gravitational wave detectors in Italy and Japan — now record a new black hole merger roughly once every three days.


However January was “the loudest gravitational wave event we have detected to date,” LIGO member Geraint Pratten of the University of Birmingham, England, said in a statement.

From a whisper to a shout
“It was like a whisper becoming a shout,” added the co-author of a new study in the Physical Review Letters.

The latest event bore striking similarities to the first one detected a decade ago.

Both involved collisions of black holes with masses of between 30-40 times that of our Sun. And both smash-ups occurred around 1.3 billion light years away.

But thanks to technological improvements over the years, scientists are now able to greatly reduce the background noise, giving them far clearer data.

This allowed the researchers to confirm a theory by another great physicist.


In 1971, Stephen Hawking predicted that a black hole’s event horizon — the area from which nothing including light can escape — cannot shrink.

This means that when two black holes merge, the new monster they create must have the same or larger surface area than the pair started out with.

Scientists analysing January’s merger, called GW250114, were able to show that Hawking was right.

Ringing like a struck bell
The black holes collectively started out at 240,000 square kilometres wide, which is roughly the size of the United Kingdom.

But after the collision, the resulting mega-black hole took up 400,000 square kilometres — about the size of Sweden.

The California Institute of Technology said that working out the final merged surface area was “the trickiest part of this type of analysis”.


“The surface areas of pre-merger black holes can be more readily gleaned as the pair spiral together, roiling space-time and producing gravitational waves,” it said in a statement.

But the signal gets muddier once the black holes start combining into a single new monster.

This period is called the “ringdown phase”, because the merged black hole rings like a struck bell — a phenomenon that Einstein also predicted.

The scientists were able to measure different frequencies emanating from this rung bell, allowing them to determine the size of the new post-merger black hole.

Kerr theory vindicated
This also enabled them to confirm the event aligned with another theory, made by New Zealand mathematician Roy Kerr in 1963.


Kerr predicted that “two black holes with the same mass and spin are mathematically identically,” a feature unique to black holes, Maximiliano Isi of Columbia University said in a statement.

Gregorio Carullo of the University of Birmingham said that “given the clarity of the signal produced by GW250114, for the first time we could pick out two ‘tones’ from the black hole voices and confirm that they behave according to Kerr’s prediction.”

Scientists are working to find out more about black hole mergers, with several new gravitational wave detectors planned for the coming years — including one in India.

Gravitational waves from black hole smash confirm Hawking theory

Ripples in spacetime sent hurtling through the universe when two black holes smash into each other.

torontosun.com