APOD: 2008 May 20 - The Perseus Cluster of Galaxies This kind of thing is just mind blowing. To think about how many civilizations there are and how much galactic drama is taking place in this one picture…

APOD: 2008 May 20 - The Perseus Cluster of Galaxies

This kind of thing is just mind blowing. To think about how many civilizations there are and how much galactic drama is taking place in this one picture…