ESA Portal

Le fonti da cui sono tratti gli articoli inseriti nella sezione Documenti di Elettroni.

4 Set 2009 - 19:00

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 distances and ultimately understand the expansion of our Universe.