CXC: Debris from Stellar Explosion Not Slowed after 400 Years

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CXC: Debris from Stellar Explosion Not Slowed after 400 Years

Post by bystander » Wed Aug 19, 2020 8:17 pm

Kepler's Supernova Remnant: Debris from
Stellar Explosion Not Slowed after 400 Years

NASA | MSFC | SAO | Chnadra X-ray Observatory | 2020 Aug 19
Click to view full size image 1 or image 2
Kepler's Supernova Remnant (SN 1604) 2014
Credit: NASA/CXC/Univ of Texas at Arlington/M. Millard et al

Astronomers have used NASA's Chandra X-ray Observatory to record material blasting away from the site of an exploded star at speeds faster than 20 million miles per hour. This is about 25,000 times faster than the speed of sound on Earth.

Kepler's supernova remnant is the debris from a detonated star that is located about 20,000 light years away from Earth in our Milky Way galaxy. In 1604 early astronomers, including Johannes Kepler who became the object's namesake, saw the supernova explosion that destroyed the star.

We now know that Kepler's supernova remnant is the aftermath of a so-called Type Ia supernova, where a small dense star, known as a white dwarf, exceeds a critical mass limit after interacting with a companion star and undergoes a thermonuclear explosion that shatters the white dwarf and launches its remains outward.

The latest study tracked the speed of 15 small "knots" of debris in Kepler's supernova remnant, all glowing in X-rays. The fastest knot was measured to have a speed of 23 million miles per hour, the highest speed ever detected of supernova remnant debris in X-rays. The average speed of the knots is about 10 million miles per hour, and the blast wave is expanding at about 15 million miles per hour. These results independently confirm the 2017 discovery of knots travelling at speeds more than 20 million miles per hour in Kepler's supernova remnant. ...

An Ejecta Kinematics Study of Kepler's Supernova Remnant
with High-resolution Chandra HETG Spectroscopy
~ Matthew J. Millard et al Freely Expanding Knots of X-Ray-Emitting Ejecta in Kepler's Supernova Remnant ~ Toshiki Sato et al
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Re: CXC: Debris from Stellar Explosion Not Slowed after 400 Years

Post by BDanielMayfield » Thu Aug 20, 2020 12:00 am

Not much mystery here. Near perfect vacuum can't cause much drag.
Just as zero is not equal to infinity, everything coming from nothing is illogical.