Earth, Moon, and Sun

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Across
  1. 2. when the moon is swollen on one side
  2. 3. the first astronaut group named by NASA
  3. 6. the phases of the moon shrinking
  4. 8. summer is the longest day, winter is the shortest day
  5. 10. two days a year when daytime and nighttime hours are equal
  6. 13. the first American in space
  7. 14. the first artificial satellite in space (Russian)
  8. 15. the only star in Earth's solar system
  9. 16. a season in the Northern hemisphere in which the North Pole is tilted away from the sun
Down
  1. 1. a season in the Northern hemisphere in which the North Pole is tilted toward the sun
  2. 4. the name of the space shuttle that exploded after liftoff in 1986
  3. 5. when the Earth, Moon, and Sun line up and one blocks the other, can be lunar or solar
  4. 7. the first man to set foot on the moon
  5. 9. the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun
  6. 11. a tiny sliver of the moon
  7. 12. the phases of the moon growing
  8. 13. an invisible line between the North and South poles that goes through the center of Earth