You're looking at the longest X-ray timelapse of a supernova ever captured. In 1604, a new star appeared in the night sky. It was so bright it outshone Jupiter for weeks. Today, we know what caused it: a white dwarf star exploded — a Type Ia supernova — blasting itself apart in one of the most powerful events in the universe. More than 400 years later, we’re still watching its aftermath unfold. Using 25 years of data from NASA’s Chandra X-ray Observatory, astronomers have released the longest X-