The Milky Way consists of 100,000 million stars. It appears sedate, placid, unchanging as it curves, a river of stars across the bowl of the night-sky. We know, however, that it is a dynamic structure; it must have had a violent youth in which it was cobbled together from various bits and pieces, from blobs of dark matter, streams of gas, and smaller stellar systems.
KeywordsDark Matter Violent Youth North Fork Orion Nebula Intelligent Life
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