Space history and Solar bodies

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Across
  1. 3. What the universe started with
  2. 5. electrons attached to this
  3. 6. this type of planet is giant and has no solid surface
  4. 10. One of the biggest planets in our solar system with a ring
  5. 11. One of the smallest planets in our solar system and the closest to the sun
  6. 12. what end up turning into planets after gaining mass
  7. 13. This forms from dust gas and ice because of gravity
Down
  1. 1. creates a large amount of energy and makes new elements
  2. 2. the catalyst for nearly everything in space
  3. 4. the debris that doesnt turn into a planet
  4. 5. has the longest orbit in our solar system
  5. 7. these form after gas clouds condense and gravitate too each other
  6. 8. electrons attached to this
  7. 9. Has the shortest day in earth hours in the solar system
  8. 11. E = ?c^2