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GALACTIC UNIVERSE

GALACTIC UNIVERSE. Twinkle, twinkle, little star, how I wonder what you are?. What are stars? And what are they made of?. Stars are huge, hot, bright balls of gas. Stars have different temperatures. Stars are of different colors. Stars are made of different elements.

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GALACTIC UNIVERSE

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  1. GALACTIC UNIVERSE

  2. Twinkle, twinkle, little star, how I wonder what you are? • What are stars? • And what are they made of?

  3. Stars are huge, hot, bright balls of gas. • Stars have different temperatures. • Stars are of different colors. • Stars are made of different elements.

  4. Stars are of different colors. Betelgeuse Rigel Which star is hotter?

  5. Composition of Stars • Stars are made of different elements in the form of gases. • A star is very dense and hot. • The outer layers of a star (atmosphere) are made of cooler gases (elements). • The elements emit certain wavelengths of light (fingerprints)

  6. The Fingerprints of Elements Emission Spectral Lines Hydrogen Helium Neon Sodium Mercury

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

  8. 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

  9. Spiral Galaxy

  10. Spiral Galaxy

  11. Spiral Galaxy

  12. Spiral Galaxy

  13. 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

  14. Elliptical Galaxy

  15. Elliptical Galaxy

  16. Elliptical Galaxy

  17. Elliptical Galaxy

  18. 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

  19. Irregular Galaxy

  20. Irregular Galaxy

  21. Irregular Galaxy

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

  23. Stellar Nebula

  24. Stellar Nebula

  25. Stellar Nebula

  26. Stellar Nebula

  27. Planetary Nebula

  28. Planetary Nebula

  29. Planetary Nebula

  30. Planetary Nebula

  31. Colliding Galaxies

  32. Betelgeuse Rigel Orion Constellation

  33. Supernovae

  34. Top View Side View Elliptical Galaxy Irregular Galaxy

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