Researchers rewind the clock to calculate age and site of supernova blast

Astronomers are winding back the clock on the expanding remains of a nearby, exploded star. By using NASA's Hubble Space Telescope, they retraced the speedy shrapnel from the blast to calculate a more accurate estimate of the location and time of the stellar detonation.

source https://phys.org/news/2021-01-rewind-clock-age-site-supernova.html