Astronomy Puzzle

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Across
  1. 1. known as dirty snowballs
  2. 7. study of weather
  3. 8. moment in a curved path around another object
  4. 10. closest star to us beside Sun
  5. 11. study of earth
  6. 13. one of the first to use the telescope
  7. 14. the galaxy we are in
  8. 15. has an upside-down rotation
Down
  1. 2. rocky body on earths surface from space
  2. 3. creator of heliocentric theory
  3. 4. small,rocky body that travels in space
  4. 5. spinning of Earth on its axis.
  5. 6. Sun is mostly made of this
  6. 9. study of space
  7. 12. distance light travels in a year