The Planets

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Across
  1. 1. the amount of matter that an object contains; the amount of space something takes up
  2. 4. the solar system that we live in
  3. 6. when two objects crash into one another
  4. 7. a sun from another solar system
  5. 8. the time that it takes a planet to turn in one full circle
  6. 10. the action of lightly scraping another object
  7. 14. the distance that you must travel to go all the way around an object
  8. 15. a star that warms our solar system
Down
  1. 2. a layer of gases that wrap around a planet
  2. 3. the planet that you live on. You should know this much.
  3. 5. the action of moving in a circle around a planet or star due to gravitational pull
  4. 9. the time that it takes a planet to orbit the sun one time
  5. 11. small bits of stuff that come off of an object
  6. 12. a planet with a ring around it
  7. 13. the force that pulls things toward each other, AKA the reason that you are not floating into space right now