10.1 Development of astronomy

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Across
  1. 2. An ancient astronomer who developed a model using circles to explain planetary motion
  2. 3. The planet that is able to support life as we know
  3. 6. A model that places the sun at the centre of the planetary system
  4. 11. An astronomer who lived from 90 to 168 A.D believed the Earth was __________ at the centre
  5. 12. The tendency of an object to resist a change in its motion
  6. 13. The astronomer who proposed that Earth and the other planets revolve around the sun
  7. 14. The apparent ‘backward’ movement of a planet
Down
  1. 1. A model that places Earth at the centre of the universe
  2. 2. A celestial body that appears to wander against the background of distant stars
  3. 4. The astronomer who discovered that planetary orbits are elliptical
  4. 5. In KEPLER’S SECOND LAW, a planets orbital speed changes depending partly on it ________ from the sun
  5. 7. The curved path followed by a planet around the sun
  6. 8. Our solar system’s star
  7. 9. A smaller circle used in the geocentric model to explain a planets unusual motion
  8. 10. The shape of the path followed by a planet according to KEPLER’S LAW