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