Unit 1

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Across
  1. 4. Sun at the center of the universe
  2. 6. A collection of planets, moons, asteroids, and comets that orbit around a star
  3. 9. states that planets move in elliptical orbits with the sun at one focus
  4. 11. the curved pATH FOLLOWED BY A CELESTIAL BODY
  5. 12. Stating that a line segment joining a planet and the sun sweeps out equal areas during equal intervals of time
Down
  1. 1. Earth at the center of universe
  2. 2. the entirety of space, time, matter, and energy
  3. 3. spinning of a celestial body on an axis
  4. 5. states that the square of the orbital period of a planet is directly proportional to the cube of its average distance from the sun
  5. 7. an imaginary line around which a celestial body rotates on
  6. 8. a celestial body that orbits around a star
  7. 10. the amount of matter in an object