Space

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Across
  1. 3. What happens to light when the emitter is moving away from you (8)
  2. 4. The closest planet to the Sun (7)
  3. 6. Refracts light within a telescope (4)
  4. 11. Reflects light within a telescope (6)
  5. 12. A scientific theory about how the universe started (3,3)
  6. 13. Planets that have a solid surface (11)
  7. 14. Natural satellites (5)
  8. 18. The biggest planet (7)
  9. 19. Things that orbit other things (9)
Down
  1. 1. Small stars end up as these (5,5)
  2. 2. The red planet (4)
  3. 5. Cosmic Microwave Background ________ (9)
  4. 7. It's where you live (5)
  5. 8. A ball of burning gas in space (4)
  6. 9. A kind of pressure that balances out with gravity on a star (7)
  7. 10. Measured in kilograms (4)
  8. 12. The heaviest stars end up as these (5,4)
  9. 15. The attractive force between every particle with mass (7)
  10. 16. NOT measured in kilograms (6)
  11. 17. Has a carbon dioxide atmosphere (5)