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The Milky Way and other galaxies

The Milky Way and other galaxies. Orion: star formation. Galaxy. A collection of millions or billions of stars 100 billion galaxies or more may exist (10 10 galaxies, each with 10 10 stars) We live in the Milky Way galaxy. Galaxy M73. The Milky Way.

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The Milky Way and other galaxies

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  1. The Milky Way and other galaxies Orion: star formation

  2. Galaxy • A collection of millions or billions of stars • 100 billion galaxies or more may exist (1010 galaxies, each with 1010 stars) We live in the Milky Way galaxy Galaxy M73

  3. The Milky Way • Our solar system is near the outer edge of the milky way galaxy • Because we are inside the Milky Way we can not see what it looks like from the outside.

  4. Clusters • Gravity pulls galaxies together • Our ‘Local Group’ contains the Milky Way, Andromeda, and 30 other galaxies Superclusters : the largest structure in the Universe, 1 million light years across

  5. 3 Types of galaxies • Spiral: has a bulge in the center, with radiating arms and older stars are in the center, younger stars in arms • Elliptical: spherical or egg- shaped, mostly older stars, reddish color • Irregular: don’t have a defined structure

  6. How galaxies begin • The deeper into space we look, the farther back in time we see. • Quasars, the most distant and radiant objects in space, may be the centers of young galaxies. • They may have black holes at their centers

  7. How galaxies evolve • Younger galaxies are blue • Colors change as the gas and dust are consumed, and the stars cool • Galaxies can collide, changing their shape and generating new stars • Older galaxies are red I Zwicky 18 : young galaxy

  8. How galaxies age

  9. Colliding galaxies • NGC 6242 are galaxies that are circling each other. • The colored centers are black holes • At some point, they will merge Photo by Keck observatory

  10. Relative sizes of galaxies • Review • What are clusters? • What are the 3 types of galaxies? • What may be at the center of young galaxies?

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