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15-3 | Galaxies

15-3 | Galaxies. What are galaxies?. Large groupings of stars in space Contain gas clouds and dust Come in a variety of sizes and shapes. Spiral Galaxies. Spiral galaxies have a bulge at the center and very distinctive spiral arms. The Milky Way.

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15-3 | Galaxies

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  1. 15-3 | Galaxies

  2. What are galaxies? • Large groupings of stars in space • Contain gas clouds and dust • Come in a variety of sizes and shapes

  3. Spiral Galaxies • Spiral galaxies have a bulge at the center and very distinctive spiral arms

  4. The Milky Way • From Earth, we see our galaxy as a bright band of stars that cuts across the night sky • 200 billion stars including the sun • Our sun is located about two-thirds of the way between the center of the galaxy and its edge

  5. Elliptical Galaxies • Round or oval in shape • Up to 5 trillion stars • Very bright centers • Very little dust or gas • No new stars forming • Only old stars

  6. Irregular Galaxies • Have no definite shape • Some form when galaxies collide

  7. Contents of Galaxies • Globular cluster – highly concentrated group of stars • Nebula – cloud of gas and dust where stars are born • Open cluster – group of 100-1000 stars that are close together relative to other stars

  8. Quasars • Most distant objects in our universe • Star-like sources of energy located in the center of galaxies • May be caused by massive black holes in the cores of galaxies • Power of 10 trillion suns

  9. Origins of Galaxies • Because light takes time to travel through space, looking through a telescope is likelooking back in time • Looking at distant galaxies reveal what early galaxies look like • This information gives scientists ideas about how galaxies form and how galaxies change over time

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