Cosmic Mystery Deepens
The difficulties trying to fathom and understand what we detect and observe or see billions of light years away.
Abell 520 in the Constellation of Orion some 2.4 billion light years away, where astronomers have discovered a chaotic scene unlike any witnessed before in a collision between giant galaxy clusters. The results challenge our understanding of the way clusters merge, they possibly make us even reexamine the nature of dark matter itself.
There are three main components to galaxy clusters: individual galaxies composed of billions of stars, hot gas in between the galaxies, and dark matter, a mysterious substance that dominates the cluster mass and can be detected only through its gravitational effects.
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