In honor of the telescope's 19th birthday--April 24, 2009--NASA has released its list of the top 12 science discoveries made using Hubble pictures, including this picture of the so-called Bullet Cluster. Combined with data from two other telescopes, Hubble's view of the cluster shows what happens when two large groups of galaxies collide. The image was hailed in 2006 as the first direct proof of dark matter, a still unidentified substance thought to make up most of the total universe mass. (source: news.nationalgeographic.com)
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