Last Updated: Wednesday, June 25, 2014, 11:14
Researchers are mystified by a mysterious X-ray signal which has been found in a detailed study of galaxy clusters using NASA`s Chandra X-ray Observatory and ESA`s XMM-Newton.
Last Updated: Tuesday, November 26, 2013, 20:47
Astronomers have discovered that a reverse shock wave racing inward at Mach 1,000 (1,000 times the speed of sound) is heating the remnant of Tycho`s supernova and causing it to emit X-ray light.
Last Updated: Tuesday, November 26, 2013, 15:24
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