In 1604, astronomers like Johannes Kepler saw a supernova in Earth's sky. (This one is now named for him!) Star explosions eject material at 20 million+ mph/32M kph. The extreme brightness may only last for seconds, but the remnants remain for millennia. https://go.nasa.gov/3EKMryz #NASAExoplanets
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.
