SPACE!!!

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Across
  1. 3. active instelluar space probe
  2. 6. a multinational, permanently crewed orbital laboratory in space
  3. 7. the amount of matter in a object
  4. 8. the most abundent element in the universeu
  5. 11. the planet we live on
  6. 13. a giant cloud of gas and dust in space
  7. 14. the current north star
  8. 16. the natural property of matter that causes it to resist any change in its motion
  9. 17. where the gravity is so strong that nothing can escape
  10. 18. without this we would be floating right now
  11. 21. what we use to measure distace in space
Down
  1. 1. 1 hour and 30 miniutes
  2. 2. a group of stars that form a pattern in the sky
  3. 4. doughnut-shaped region of icy debris and dwarf planets that orbits the Sun beyond Neptune
  4. 5. the closest large spiral galaxy to the milky way
  5. 8. a large space observitory launched by nasa
  6. 9. orbits around earth and is man made
  7. 10. the galaxy we see
  8. 12. closest star system to our solar system
  9. 15. what planets do around the sun
  10. 18. the milky way is a...
  11. 19. we live on one and they orbit the sun
  12. 20. a lit up object there in the night sky and their is trillions