Amazing Sites in the Sky: Constellations

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Across
  1. 2. happening only in certain seasons
  2. 5. the measure of a star's brightness
  3. 9. the half of Earth that is south of the equator
  4. 10. groups of visible stars that form patterns when viewed from Earth
  5. 11. masses of burning gas visible in the sky, especially at night
  6. 12. very old, or belonging to a period long ago
  7. 13. a group of stars that forms a pattern in the sky and has a popular name but is smaller than a constellation
Down
  1. 1. scientists who study the stars, planets, and outer space
  2. 3. the science of determining the position of something or a distance traveled
  3. 4. the total amount of energy that a star gives off
  4. 6. power from a source that produces light and heat
  5. 7. a position or perspective from which something is viewed
  6. 8. the half of Earth that is north of the equator