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. Source: [url=http://www.nasa.gov/mission_pages/chandra/images/keplers-supernova-remnant-debris-from-stellar-explosion-not-slowed-after-400-years.html]Kepler's Supernova Remnant: Debris from Stellar Explosion Not Slowed After 400 Years[/url]