Solar system

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Across
  1. 4. the star at the center of the Solar System
  2. 5. a substance composed of the chemical elements hydrogen and oxygen
  3. 10. the substance's mass per unit of volume
  4. 11. distance traveled by light in one year
  5. 13. has a ring system similar to Saturn
  6. 14. its mass is twice the amount of all the planets in solar system
  7. 15. further planet from the Sun
Down
  1. 1. gravitationally bound system of the Sun and the objects that orbit it
  2. 2. a portion of the electromagnetic radiation given off by the Sun
  3. 3. third planet from the Sun
  4. 6. the force by which a planet or other body draws objects toward its center
  5. 7. 'green house' planet
  6. 8. smallest planet in the solar system
  7. 9. 'giant gas' planet with 62 moons
  8. 12. has two moons, Phobos and Demos