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from The Science Show

| | | Sun, 20 Apr 2008 04:28

Galactic clusters Clusters of galaxies are the largest gravitationally bound systems in the universe. Some are 1015 solar masses. That´s 1,000,000,000,000,000 times the mass of the sun. Christine Jones describes how and why galaxies cluster. One famous cluster is the bullet cluster. Death Star Dan Evans has found two galaxies merging. Each hosts a supermassive black hole. One is sending out a jet of particles. This contradicts the earlier idea that black holes only swallow matter. Oscillating stars Most starts oscillate in some way. Detecting oscillations allows astronomers to see the properties...

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