space
NASA’s Flagship X-Ray Telescope Back Online After Weekend Safe Mode

One of NASA’s flagship telescopes, the Chandra X-Ray Observatory, went into safe mode last week following gyroscope problems. That telescope is now back up and running. Read More >>

space
Watch The Tycho Supernova Remnant Expand, Centuries After It First Exploded

Astronomers have used 15 years of X-ray data to make this video of the remnants of a white dwarf that famously exploded in 1572. Nearly 450 years later, the debris from the explosion is still expanding. Read More >>