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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion 5nvklj





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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion

Dragon
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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion Empty Giant space bubble reveals reverse shockwaves from a catastrophic star explosion

Post by Dragon Tue Oct 19, 2021 3:43 am

NASA telescopes have captured the colorful blast of a stellar explosion thousands of years ago, shedding new light on the evolution of such cosmic remains.

When a star reaches the end of its life, it explodes in a bright burst called a supernova.

White dwarfs are the dim, fading corpses of stars that have exhausted most of their nuclear fuel and shed their outer layers.

Having shrunk to a relatively small size, white dwarfs are considered among the most stable of stars, given they can last for billions or even trillions of years.

However, when a white dwarf passes near a neighboring star it may siphon too much material from its companion, causing it to grow unstable and explode, resulting in a Type Ia supernova.

That is the case of a stellar remnant — formally known as G344.7-0.1 — that is located roughly 19,600 light-years from Earth, and believed to be between 3,000 and 6,000 years old, according to a statement from NASA's Chandra X-ray Observatory.


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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion 334pu7m
Dragon
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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion Empty Re: Giant space bubble reveals reverse shockwaves from a catastrophic star explosion

Post by Dragon Tue Oct 19, 2021 3:44 am

Giant space bubble reveals reverse shockwaves from a catastrophic star explosion MB8juaVMHeuA6bjxij3G2m-970-80
(Image credit: X-ray: NASA/CXC/Tokyo Univ. of Science/K. Fukushima, et al.; IR: NASA/JPL/Spitzer; Radio: CSIRO/ATNF/ATCA)

Supernova remnant G344.7-0.1, located 19,600 light years from Earth, is the result of a white dwarf stellar explosion that occurred between 3,000 and 6,000 years ago.


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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion 334pu7m
Dragon
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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion Empty Re: Giant space bubble reveals reverse shockwaves from a catastrophic star explosion

Post by Dragon Tue Oct 19, 2021 3:46 am



When a Stable Star Explodes

White dwarfs are among the most stable of stars.

They are stars that have exhausted most of their nuclear fuel and shrunk to about the size of Earth, yet still contain about the same mass as the Sun.

Left on their own, white dwarfs can last for billions or even trillions of years.

However, a white dwarf with a nearby companion star can become a cosmic powder keg.

If the companion's orbit brings it too close, the white dwarf can pull material from it until the white dwarf grows so much that it becomes unstable and explodes.

This kind of stellar blast is called a Type Ia supernova.

While astronomers generally accept that such encounters between white dwarfs and "normal" companion stars are one likely source of Type Ia supernova explosions, many details of the process are not well understood.

One way to investigate the explosion mechanism is to look at the elements left behind by the supernova in its debris or ejecta.


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Giant space bubble reveals reverse shockwaves from a catastrophic star explosion 334pu7m

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