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GALACTIC UNIVERSE

GALACTIC UNIVERSE. What is a Galaxy?. It is a group of billions and billions of stars held together by gravity. Spiral Galaxy. Bulge. Disk. Side View. Top View. Huge; contains stars, gas, and dust Held together by gravity Pinwheel shape/looks like a hurricane Bulge and thin disk

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GALACTIC UNIVERSE

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  1. GALACTIC UNIVERSE

  2. What is a Galaxy? It is a group of billions and billions of stars held together by gravity.

  3. Spiral Galaxy Bulge Disk Side View Top View • Huge; contains stars, gas, and dust • Held together by gravity • Pinwheel shape/looks like a hurricane • Bulge and thin disk • Halo (glow) is present • Rich in gas and dust • Young and old stars are present

  4. Spiral Galaxy

  5. Spiral Galaxy

  6. Spiral Galaxy

  7. Spiral Galaxy

  8. Elliptical Galaxy • Huge; contains stars, gas, and dust • Held together by gravity • Round to oval • Bulge but no disk • Halo is present • Little cool gas and dust • Mainly OLD STARS are present

  9. Elliptical Galaxy

  10. Elliptical Galaxy

  11. Elliptical Galaxy

  12. Elliptical Galaxy

  13. Irregular Galaxy • Huge; contains stars, gas, and dust • Held together by gravity • No regular shape • May show signs of a disk and/or bulge • Halo is present • Usually rich in gas and dust • Young and old stars are present

  14. Irregular Galaxy

  15. Irregular Galaxy

  16. Irregular Galaxy

  17. Nebulae Stellar Nebula (where stars are born) Planetary Nebula (death of a star) Movie

  18. Stellar Nebula

  19. Stellar Nebula

  20. Stellar Nebula

  21. Stellar Nebula

  22. Planetary Nebula

  23. Planetary Nebula

  24. Planetary Nebula

  25. Planetary Nebula

  26. Colliding Galaxies

  27. Betelgeuse Rigel Orion Constellation

  28. Supernovae

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