All About Stars

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Across
  1. 3. When an overage star begins to cool and expand
  2. 5. The birth place of all stars
  3. 6. Brightness
  4. 9. A 2-dimensional graph used to classify stars
  5. 15. Also known as a pulsar
  6. 16. A red giant't outer layers drift away
  7. 17. The center of an atom
  8. 18. A measure of temperature used by astronomers
  9. 20. The most massive stars will end up as this
  10. 21. A process by which larger elements form
  11. 22. A table organizing all elements by atomic#
  12. 23. A positively charged subatomic particle
Down
  1. 1. The remains of an average star's core
  2. 2. Most stars are classified as this
  3. 4. Equal to the number of protons in an atom
  4. 7. The element with atomic number two
  5. 8. A very massive star
  6. 10. Can live for over 10 billion years
  7. 11. The most abundant element in the universe
  8. 12. The last element stars can fuse before supernova
  9. 13. An explosion at the end of a star's life cycle
  10. 14. A state of matter where electrons are separated
  11. 19. Energy from the sun