Kepler’s supernova remnant: Debris from stellar explosion not slowed after 400 years

Kepler’s supernova remnant: Debris from stellar explosion not slowed after 400 years
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.
phys.org
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