Stars and Galaxies

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Across
  1. 1. Light cannot escape its intense gravitational pull.
  2. 5. Gravity pulls particles together and energy is converted to heat.
  3. 6. A galaxy with no particular shape, rich in gas and dust.
  4. 8. A star's true brightness.
  5. 10. Fusion occurs during this stage, 90% of all stars in an H-R diagram are in this stage.
  6. 12. Interstellar dust and gases such as hydrogen, helium and heavy elements.
  7. 15. A cloud of gas which forms when Helium fuses to Carbon.
  8. 17. A dead star.
  9. 18. A massive, relatively cool star and expands and contracts and make heavy elements up to Iron.
Down
  1. 2. A galaxy with the shape of a sphere to a disk, most common type of galaxy.
  2. 3. A galaxy with flattened arms and a bar through the center.
  3. 4. A hot dense core that shines for billions of years.
  4. 7. When massive stars terminate in a brilliant explosion.
  5. 9. Brighter than a main sequence star, happens when about 20% of Hydrogen fuses into Helium.
  6. 11. A pinwheel galaxy with a nucleus of bright stars.
  7. 13. Affected by a star that's further away.
  8. 14. A star is born when this begins.
  9. 16. A super dense ball of neutrons with relatively low mass.