Space Crossword- Nora T

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Across
  1. 3. pluto is now classiffied as a _____
  2. 7. not weight, but ___; same on all planets, quantity of matter
  3. 9. the only thing other than earth humans have landed on
  4. 10. the sun is also a ___
  5. 11. most common theory on the origin of the universe
  6. 13. the Milky Way, for example
  7. 15. a number which scales, or multiplies, some quantity
  8. 16. either natural or artificial, orbits object in space
  9. 18. all of space and time and its contents as we know it
  10. 19. to circle around a larger object (in space)
  11. 20. 365 days of travel at light speed
Down
  1. 1. Earth is our
  2. 2. Earth perceived as the center (not heliocentric but _)
  3. 4. science of space
  4. 5. magnifies,observes space/makes distant objects clear
  5. 6. the things that surround and orbit the Sun
  6. 8. not elliptical or irregular, rather ____
  7. 12. often described as having a tail, hurtles through space
  8. 14. the earth spins on it's __
  9. 17. Einsteins Theory of ____ was a major step in physics