Space Crush

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Across
  1. 2. a place in space where gravity pulls so much that even light can not get out
  2. 3. most well known constellation
  3. 6. relating to the world or the universe
  4. 8. what is our solar system
  5. 10. how many astronauts have walked on the moon
  6. 11. coldest planet in our solar system
  7. 12. the planet is closest in size to Earth
Down
  1. 1. tubular optical instrument for viewing space
  2. 4. which planet has the fastest rotation?
  3. 5. electromagnetic radiation of the shortest wavelength and highest energy
  4. 7. sixth planet from the Sun
  5. 9. a band of small celestial bodies beyond the orbit of Neptune from which many short-period comets are believed to originate