Gravity and the Formation of the Solar System

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Across
  1. 6. sun centered solar system
  2. 7. force where a more massive object puts a big dent in the fabric of space
  3. 9. the inner rocky planets
  4. 10. ancient Greek astronomer who developed the first model of the solar system
  5. 11. the outer planets made mostly of atmosphere
  6. 12. the shape of a planet's orbit around the sun
  7. 16. during nuclear fusion hydrogen gets fused into this element
  8. 17. movement of one object around a more massive object
  9. 18. astronomer who developed the 3 laws of planetary motion
Down
  1. 1. described gravity and created 3 laws of motion
  2. 2. when gas and dust collapse at the beginning of the formation of the solar system
  3. 3. force that is combined with gravity to keep planets in orbit
  4. 4. force is a measurement of mass times this force
  5. 5. as a nebula collapses it flattens into this
  6. 8. astronomer that explained the geocentric model by saying planets move in circles on circles
  7. 13. earth centered solar system
  8. 14. proved that Copernicus was correct by discovering 4 moons of Jupiter and phases of Venus
  9. 15. first astronomer to create a true heliocentric model with planets orbiting in perfect circles