Astronomy

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Across
  1. 4. Proved that there are other galaxies, and that they are moving away from us
  2. 6. Had excellent data
  3. 7. Smaller than a planet
  4. 10. ______ Constellations that can be seen all year round
  5. 11. Discovered gravity
  6. 12. Established an observatory in Flagstaff, AZ., predicted Pluto
  7. 14. Added proof that the planets orbited the sun
  8. 15. Larger than a star, smaller than a galaxy
  9. 16. Everything we know exists
Down
  1. 1. Larger than a System, smaller than the Universe
  2. 2. Larger than a Moon, smaller than a System
  3. 3. Discovered that planets had elliptical orbits and the three laws of planetary motion
  4. 5. A circumpolar constellation that is also known as the Big Dipper
  5. 8. Constellation shaped like an hourglass
  6. 9. Discovered that the sun was the center of the Solar System
  7. 10. A region of the sky with a recognizable star pattern
  8. 13. Thought Earth was at the center of the universe, put together the first Astronomy text book
  9. 15. Smaller than a system, larger than a planet