Galaxy Clusters, Blue Stars and Cosmic Explosions
Photo: X-ray: NASA/CXC/Rutgers/J.Hughes et al, Optical
Giant Galaxy Cluster
In the far-flung distant universe, 7 billion light years away, a super galaxy cluster has been discovered by an international team of scientists. It's so astonishingly enormous that it's been dubbed El Gordo -- Spanish for "the fat one."
It is the most massive, hottest, brightest galaxy cluster ever seen, and much of its mass is made up of dark matter. In fact, scientists believe what they're seeing is two separate clusters colliding at several million miles per hour, wrenching normal matter apart from the dark matter.