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Unformatted text preview: the greatest mysteries in astronomy: o Most of Milky Ways light comes from disk and bulge o But most of the mass is hidden in its halo How do galaxies move within the universe? o Galaxies are carried along with the expansion of the universe o Those further away from us seem to be expanding faster than those closer to us (raisen bread) o Expanding universe figured out by Edwin Hubble All galaxies outside our local group are moving away from us The more distant the galaxy, the fast it is racing away We live in an expanding universe Never still o Earth rotates on axis 1000 km/hr o Earth orbits Sun: 100,000 km/hr o Solar system moves among stars: 70,000 km/hr Milky Way rotates...
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- Spring '11
- Solar System