Models of the Solar System

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Across
  1. 2. The prefix that relates to the sun.
  2. 6. In the heliocentric model, all planets move at ___________ speeds.
  3. 10. Plato and Ptolemy worked with _________ to formulate the geocentric model of the universe.
  4. 11. Model of the universe which places the Sun at the centre.
  5. 12. The god who carried the universe on his back, according to the ancient Greeks.
Down
  1. 1. A phenomenon where it was observed that the planets seemed to turn around and move backwards.
  2. 3. In the geocentric model, the moon, sun, other planets and stars _________ around Earth.
  3. 4. Model of the universe which places Earth at the centre.
  4. 5. The prefix that relates to earth.
  5. 7. The shape of the orbit made by planets in the heliocentric model.
  6. 8. In the heliocentric model, all planets move in the _________ direction.
  7. 9. The astronomer who worked with Galileo to propose the heliocentric model of the universe.