Solar system

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Across
  1. 2. Principal fuel of our sun (element)
  2. 3. The sun, like most stars, shines through nuclear _____.
  3. 5. Planet best known for large ring system
  4. 8. Number of moons held by all of the inner solar system planets
  5. 11. Distance between sun and earth: ___ unit
  6. 13. Elliptical path of revolution by which planets travel around sun
  7. 14. Separates inner from outer planets: ___ belt
  8. 15. Weakest of the four fundamental physical forces
Down
  1. 1. Planet with most extreme axial tilt in solar system
  2. 4. Largest planet in the solar system
  3. 6. Most distant planet in the solar system
  4. 7. The sun is a yellow ___ type star
  5. 9. The only planet in the observable universe known to contain life
  6. 10. Imaginary disc-shaped plane containing the planets' orbits around the sun.
  7. 12. Closest planet to the sun
  8. 14. Gives us our seasons: __ tilt