Extension of vocabulary 29.2

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Across
  1. 3. The region in a diagram most stars occupy.
  2. 5. A apparent shift in position caused by the motion of the observer.
  3. 6. The energy output from the surface of a star per second.
  4. 8. When only two stars are gravitationally bound together and orbit a common center of mass.
  5. 9. How bright a star appears.
Down
  1. 1. How bright a star would appear if it were placed at a distanced of 10pc.
  2. 2. A group of stars named after animals, mythological characters, or everyday objects.
  3. 4. The relationship between two stars demonstrated on a graph.
  4. 7. One of two units of measurement astronomers use to measure long distances. Longer than a lightyear.