The Solar System

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Across
  1. 2. How many moons does mars have?
  2. 3. Approximately how old is the Universe?
  3. 5. Which scientists played a major role in overturning the ancient idea of an Earth-centered universe?
  4. 8. Belt What is it called that has a region of the solar system beginning just beyond the orbit of neptune and contains many icy comets?
  5. 10. What plant other than earth has been visited by the largest number of robotic spacecraft?
  6. 11. Once considered a plant, but its now a dwarf plant?
  7. 12. What is it called that has a trillion or so comets thought to orbit the sun at great distances?
  8. 14. Rocky space object of varying size?
  9. 16. and Helium What is the sun mainly made of?
  10. 17. What is earth's moon called?
Down
  1. 1. The average distance of Earth from the Sun is called a/an _____________.
  2. 4. The Huge space which contains all of the matter and energy in existence?
  3. 6. What has the Similar character to mar's moon?
  4. 7. The Third closest plant to the sun?
  5. 9. and Einstein
  6. 10. The Smallest Plant in our solar system?
  7. 13. A force that pulls you towards the center of a plant?
  8. 15. Mar's has the biggest____in the solar system?