Gary and the Crossword Puzzle

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Across
  1. 2. Unit of astronomical distance
  2. 7. A system of millions or billions of stars
  3. 8. A luminous sphere of plasma held together by its own gravity
  4. 9. A cloud of gas and dust in space
  5. 11. A group of stars forming a recognizable pattern
  6. 13. All existing matter and space considered as a whole; the cosmos
  7. 15. Person trained for space travel
  8. 17. Object that orbits another
  9. 18. Device used to observe distant objects
  10. 22. A stellar explosion that briefly outshines an entire galaxy
  11. 24. Galaxy that includes our solar system
  12. 25. Small body orbiting a larger one
  13. 26. A small rocky body orbiting the sun
  14. 27. A vehicle for driving over rough terrain, especially one driven remotely over extraterrestrial terrain
  15. 29. Relating to the moon
  16. 30. Theory explaining the origin of the universe
Down
  1. 1. Path of a celestial body or an artificial satellite as it revolves around another body
  2. 3. The force that attracts a body toward the center of the earth, or toward any other physical body having mass
  3. 4. Originating or located outside the earth or its atmosphere
  4. 5. A region of space having a gravitational field so intense that no matter or radiation can escape
  5. 6. A highly magnetized, rotating neutron star that emits beams of electromagnetic radiation
  6. 10. Shower of space rocks entering Earth's atmosphere
  7. 12. A vehicle designed for space travel
  8. 14. Relating to the sun
  9. 16. Protective garment worn by astronauts in space
  10. 19. A massively luminous celestial object
  11. 20. A celestial object consisting of a nucleus of ice and rock and a tail of gas and dust
  12. 21. Moon landing mission
  13. 23. Galaxy nearest to the Milky Way
  14. 28. Largest planet in our solar system