Most Massive Cosmic Pile up Ever Seen

Hubble+Chandra+Keck image of MACSJ0717.5+3745, a collision of four galaxy clusters.
Credit: NASA, ESA, CXC, C. Ma, H. Ebeling, and E. Barrett (University of Hawaii/IfA), et al., and STScI.

One of the most incredible images I ever seen, I think.
What exactly it is? It’s of an object 5.4 billion light years away called MACSJ0717.5+3745, which is really just a catalog number and a coordinate on the sky, so it’s not nearly as awesome sounding as what it is: a massive collision between four separate galaxy clusters! COOL !

The image is a composite data of Hubble which sees visible light, Chandra which sees which sees high-energy X-rays.

Read more on Bad Astronomy blog

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