Vocab 29.2

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Across
  1. 5. distance between two identical points on a wave
  2. 8. every particle attracts every other particle in the universe with a force that is directly proportional to the product of their mass
  3. 10. energy output from the surface of a star per second
  4. 11. different in height between the crest and the trough
  5. 12. lowest point on a wave
  6. 14. shift in position caused by the motion of the observer
  7. 17. way to organize stars
  8. 18. when electromagnetic radiation from an object undergoes an increase in wavelength
  9. 19. decrease in wavelength, with a corrosponding increase in frequency of an electromagnetic wave
  10. 20. small, blue star
Down
  1. 1. groups of stars that look like everyday objects; animals and mythological characters
  2. 2. how bright a star appears
  3. 3. region on the HR diagram where most stars fall
  4. 4. large star with high luminosity and low surface temperature
  5. 6. heat energy
  6. 7. how bright a star would appear if it were placed at a distance of ten parsecs
  7. 9. distance that light travels in a year
  8. 11. almost dead star
  9. 13. two stars that are gravitationally bound together, they orbit a common center of gravity
  10. 14. unit larger than a light year
  11. 15. refers to the change in wave frequency during the relative motion between a wave source and its observer
  12. 16. highest point on a wave