chapter 28 and 29

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Across
  1. 3. theory the sun and planets formed together from a cloud of gas and dust
  2. 5. this planet is 8.3 light minutes away from the sun
  3. 8. these planets are gaseous and have a low-density
  4. 9. a theory that our universe began with an explosion some 13.7 billion years ago
  5. 11. relatively small pieces of debris chipped off asteroids or comets
  6. 13. occur when the moon's shadow falls on part of earth
  7. 14. masses of water, methane, and ice(dirty snowball)
  8. 15. this planet is tilted 98 degrees of the orbital plane
Down
  1. 1. these planets are composed of high-density solid rock
  2. 2. this planet is most remarkable for its easily seen rings
  3. 4. this planet is the hottest planet
  4. 6. this planet has almost no atmosphere because of its small size
  5. 7. this planet is known as the giant of the solar system
  6. 10. small rocky bodies that orbit the sun
  7. 12. a meteoroid that strikes Earth's atmosphere