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Across
  1. 5. the model of the solar system where the sun is at the centre and the planets orbit it
  2. 6. the tilt of the earth on its axis and the path of orbit around the sun create these
  3. 7. the eighth planet from the sun
  4. 9. these orbit a star like the sun
Down
  1. 1. the theory that the earth was the centre of the universe
  2. 2. the planet closest to the sun
  3. 3. the earth is not sitting vertical on its axis, it is slightly what?
  4. 4. these orbit a planet
  5. 8. the third planet from the sun