Astronomy Review test 1

12345678910111213
Across
  1. 1. showed mathematically that the planets revolved in elliptical paths around the sun
  2. 3. wrote the three laws of motion that explained gravity and inertia, invented calculus
  3. 4. the imaginary line passing through both poles and the center of a planet
  4. 6. the path a planet takes as it orbits once around the sun
  5. 8. added to Aristotle's idea by explaining the movement of the planets as little circles on their spheres
  6. 9. used a telescope to study astronomy
  7. 12. stated that the Earth was still and was the center of the universe
  8. 13. first to write a book about a sun-centered solar system
Down
  1. 2. the spinning of a planet around its axis
  2. 4. tilt 23.5 degrees for Earth
  3. 5. a force that attracts one object to another
  4. 7. sun centered
  5. 10. Earth centered
  6. 11. a property of matter that states that still things remain still, moving things keep moving, unless acted on by a force