Space

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Across
  1. 3. Luna is the name of the Earth's ____
  2. 4. a region behind the orbit of Neptune
  3. 5. the _____ ______ consists of all eight planets
  4. 8. the largest ____ in the solar system is the sun
  5. 9. you can find millions or billions of stars in the ______
  6. 12. all existing matter and space considered as a whole
  7. 15. pluto is considered a _____ ______
  8. 17. the distance that light travels in one year
  9. 19. all the planets _____ around the sun
  10. 20. I looked through the _________ to see the stars
Down
  1. 1. most widely used civil calendar internationally
  2. 2. a _____ has a tail that is pointed away from the sun
  3. 6. the total amount of matter in an object
  4. 7. an object that orbits another object in space
  5. 10. the earth rotates on its ____
  6. 11. the Earth is an example of a ______
  7. 13. some think the ___ ____ ______ is how it all started
  8. 14. the space between the orbits of Mars and Jupiter
  9. 16. the branch of science that studies space
  10. 18. a vast collection of icy bodies called the ____ _____