Astronomy 1

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Across
  1. 2. the ancient model that the Earth stayed motionless at the center of the universe
  2. 5. the center of mass of 2 or more bodies
  3. 7. current model that shows Earth and the other planets orbit the sun
  4. 12. made of planets, stars, and other objects in space
Down
  1. 1. states that at one time, the entire universe was confined to a dense, hot supermassive ball that violently exploded 13.7 billion years ago
  2. 3. oval shape of a planet's orbit
  3. 4. a periodic oscillation of the Earth's axis that causes the precession of the poles to follow a wavy rather than a circular path
  4. 6. the movement of one object around the center of another object
  5. 8. process of turning or circling around something
  6. 9. motion of the Earth's axis as it traces out a circle
  7. 10. the science that studies the universe
  8. 11. the imaginary pole the Earth is tilted on