Space Puzzle

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Across
  1. 1. the weight of something
  2. 3. Nasa space probe launched in 1977
  3. 7. a constellation, the daughter of Cepheus
  4. 8. the first element on the periodic table
  5. 9. a triple star system
  6. 14. a ____ takes pictures of the earth from space
  7. 15. how fast light travels to reach something
  8. 16. this orbits the earth every ninety minutes
  9. 17. the earth is a _____
  10. 19. giant space telescope
  11. 20. newtons law of motion
  12. 21. a hole in space
Down
  1. 1. we live in the _____ galaxy
  2. 2. we have this to stay on the ground
  3. 4. the amount of time it takes the space station to orbit Earth
  4. 5. pictures in the sky is a _____
  5. 6. it comes from stars when its at the end of its life
  6. 10. the earth _____(s) around the sun
  7. 11. when you look up at the night sky you see ______
  8. 12. the planet we live on
  9. 13. we are in the Milky Way _______
  10. 17. a program that had three missions
  11. 18. a region beyond Neptunes orbit