science

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Across
  1. 3. equivalent to 31 trillion km
  2. 5. refers to anything having to do with the stars
  3. 6. indicates the rate of motion away from us
  4. 7. the combination of the star’s radial motion and proper motion
  5. 8. the extra heat produced causes the star to expand
  6. 10. a violent nuclear explosion, producing a temporary bright flash
  7. 11. the apparent magnitude that a star would have if we placed it at a standard distance
  8. 12. tells us the rate of motion toward us
  9. 14. a huge red star
  10. 15. the apparent change in position of a distant object as one’s viewing position changes
Down
  1. 1. one way of organizing information
  2. 2. the first variable stars to be observed
  3. 4. A stars brightness compared with other stars as viewed from earth
  4. 9. the star’s motion across the line of sight
  5. 13. one unit for distances between stars