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Galaxies through Space and Time - NASA

Galaxies through Space and Time2 ContentsINTRODUCTION 4 About the Hubble Space Telescope 5 Our Understanding of Galaxies : A Timeline 7 CHAPTER 1: Our Galactic Neighborhood 10 Seeking the Source of Falling Gas ..12 Studying Ancient Stars in the Milky Way ..14 Tracing the Origin of an Intergalactic Cloud ..16 Surveying Star Clusters in the Andromeda Galaxy ..17 Measuring a Giant Halo around the Andromeda Galaxy ..19 CHAPTER 2: Intriguing Galaxies across the Universe 20 Excavating a Prehistoric Galaxy in Our cosmic Backyard.

The discovery of the cosmic microwave background provides observational evidence for the Big Bang hypothesis. This means that galaxies must have evolved from a hot and dense fireball. 1970s Astronomers Vera Rubin and Kent Ford confirm the existence and dominance of dark matter in galaxies by measuring the motions of stars within. 1990

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