Science Crossword

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Across
  1. 3. More is known about the ______ than any other celestial body.
  2. 4. Fourth closest planet to the sun.
  3. 7. According to the _______ ________ the sun and planets formed together from a cloud of gas and dust. (2 words)
  4. 8. Small rocky bodies that orbit the sun.
  5. 12. Farthest away planet from the sun.
  6. 14. Since 2006 _______ has been classified as a dwarf planet.
Down
  1. 1. Another name for the outer planets.
  2. 2. In the sun ____ ________ tons of mass are converted to energy each second. (2 words)
  3. 3. Many people believed the _______ ________ galaxy made up the entire universe. (2 words)
  4. 5. The closest planet to the sun.
  5. 6. The sun is made up of mainly ________.
  6. 9. The _____ is the nearest star to Earth.
  7. 10. ________ have a mass of water, methane, and ice.
  8. 11. Second closest planet to the sun.
  9. 13. Third closest planet to the sun.