XMM-Newton uncovers a celestial Rosetta stone
October 13th, 2009
The white dwarf and its companion 3 September 2009 ESA’s XMM-Newton orbiting X-ray telescope has uncovered a celestial Rosetta stone: the first close-up of a white dwarf star, circling a companion star, that could explode into a particular kind of supernova in a few million years. These supernovae are used as beacons to measure cosmic [...]