The Big Bang & Stars

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Across
  1. 1. The universe is thought to ___ be expanding today.
  2. 3. a generalized statement made after a number of observations have taken place.
  3. 6. Hottest color star.
  4. 9. Cool stars lifespans usually tend to be ___.
  5. 10. One of the first elements in the universe (25%).
  6. 16. Color star between yellow and red
  7. 17. Color star between white and yellow
  8. 19. Our sun is considered an ___ star when it comes to brightness and luminosity.
  9. 20. One of the first elements in the universe (75%).
  10. 21. A galaxy moving away from the observer with stretched wavelengths.
Down
  1. 1. the name given to the idea that all matter in the universe was compacted into a very small unit that suddenly exploded and expanded.
  2. 2. A galaxy moving towards the observer with condensed wavelengths.
  3. 4. When we hear static on the ___ it is thought that that is the leftover energy and radiation from the Big Bang.
  4. 5. Spectral classes of stars starting with the hottest star.
  5. 7. Cool stars are usually ___.
  6. 8. Hot stars are usually ___.
  7. 9. Scientific term for 'brightness'.
  8. 11. The HR ___ is a way that scientists classify stars based on temperature and luminosity.
  9. 12. The universe went from smaller than an atom to bigger than a ___ in a fraction of a second.
  10. 13. It is thought that the Big Bang took place 13.8 ___ years ago.
  11. 14. Hot stars lifespans usually tend to be ___.
  12. 15. the explanation of why something happens in science.
  13. 18. Coolest color star.