Astronomy Extra Credit; use the book for clues.

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Across
  1. 6. 6th planet from the Sun; has at least 31 moons
  2. 8. areas on the Sun that are cooler and less bright.
  3. 10. any natural or human made object that revolves around another object.
  4. 11. theory that states the universe began 13.7 Billion Years ago after a fiery explosion.
  5. 14. space object made of dust and rock particles mixed with frozen water.
  6. 15. large cloud of gas and dust that breaks apart and can collapse to form a star.
  7. 16. a meteoroid that strikes a planet or moon.
  8. 17. late stage of a star, core heats up and can eventually explode.
  9. 20. largest and 5th planet from the Sun.
Down
  1. 1. 7th planet from the Sun; has almost a 90 degree tilt.
  2. 2. _____ year; the DISTANCE light travels in one year.
  3. 3. 2nd planet from the Sun; surface covered in volcanoes.
  4. 4. 4th planet from the Sun, reddish in color.
  5. 5. form of stars that form a pattern, given a name such as "Orion".
  6. 7. space project that put the first humans on the Moon.
  7. 9. smallest planet, closest to the Sun.
  8. 11. _____ hole; final stage of a star, gravity is so strong not even light can escape.
  9. 12. 8th planet from the Sun, bluish green in color.
  10. 13. a meteoroid that burns up in Earth's atmosphere.
  11. 18. ____ ___ Spot; a higher pressure storm on Jupiter, larger than the size of Earth.
  12. 19. a piece of rock or metal in space.