SpaceWorks Puzzle 15

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Across
  1. 2. A unit of distance equal to 3.26 light years.
  2. 3. The point farthest from Earth in the Moon's orbit.
  3. 4. The change in the colors of an astronomical object caused by its motion away from us.
  4. 7. Phenomena that occur when the Moon’s light is reflected and refracted off water droplets in the air.
  5. 8. The branch of astronomy devoted to finding evidence of intelligent life among the stars.
  6. 9. The closest major galaxy to our own.
Down
  1. 1. A device that allows astronomers to observe the spectrum of radiation from some source.
  2. 5. Atmospheric phenomena created by light which is reflected or refracted by ice crystals in the atmosphere.
  3. 6. The time it takes the Moon to pass through all of its phases.