Astronomy 1021 Chapter 22: Chapter 22 Summary Cosmic Perspective
8 Jan 2012
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Chapter twenty two: dark matter, dark energy, and the fate of the universe: Either dark matter exists or we do not understand how gravity operates across galaxy sized distances, there are many reasons to be confident about our understanding of gravity leading many to conclude that dark matter is real. What we mean by dark matter and energy: Evidence for dark matter in clusters of galaxies: The role of dark matter in galaxy formation: Because most of a galaxy s mass is in the form of dark matter the gravity of the dark matter is probably what formed protogalactic clouds and then galaxies from slight density enhancements in the early universe. Galaxies appear to be distributed in giant chains and sheets that surround great voids, these large-scale-structures trace their origin directly back to regions of slightly enhanced density in early time.
