Corey's puzzle

123456789101112131415161718
Across
  1. 1. theory that life in our galaxy started with an explosion
  2. 5. spinning on an axis
  3. 7. rocks and dust collected in space that entered earth's atmosphere
  4. 9. galaxy of stars
  5. 12. discovered the geocentric system
  6. 16. orbiting around something for a certain amount of time
  7. 18. the force of which how strong the attraction is
Down
  1. 2. Incorrect model that shows all the planets orbit around earth
  2. 3. how the earth is facing the sun determines the seasons
  3. 4. Correct model that shows all the planets orbit around the sun
  4. 6. the galaxy we live in
  5. 8. a different side of earth will be pointed to the sun each day
  6. 10. A place located in the galaxy where there are many different planets and species
  7. 11. chunks of rock and metal found in the solar system
  8. 13. creator of the heliocentric model
  9. 14. chunks of ice and dust that orbit around the sun
  10. 15. going around something
  11. 17. Rocks or dust collected in space