Chandra Has Been X-Raying the Universe for 15 Years

When the Chandra X-ray Observatory celebrates a launch anniversary, it goes big with exploding stars and rotating neutron stars. Today marks 15 years of precision X-ray investigations of stars, galaxies, black holes, neutron stars, and even dark energy. NASA celebrates with supernova and pulsars. » 7/24/14 1:37am Today 1:37am

Galactic Cluster Collision Divides Ordinary Matter from Dark Matter

Almost six billion years ago, two of the largest gravitational structures in the universe slammed into each other with velocities in the millions of miles per hour. Galactic clusters are collections of galaxies (sometimes thousands of them) that seem to hang together in violation of the known laws of physics. Not only… » 8/29/08 8:00am 8/29/08 8:00am