Heaviest, Farthest Cluster Points Toward Dark Energy

The XMM-Newton space telescope has been really into dark and heavy stuff lately. No, the x-ray observatory didn't find its parents' old Black Sabbath albums — it found the most massive galactic cluster on record, a conglomerate of galaxies weighing more than 1,000 times as much as the Milky Way. The cluster's extreme… » 9/03/08 8:00am 9/03/08 8:00am