Are we really made of stardust?

1234567891011
Across
  1. 3. An object so massive not even light can escape
  2. 4. The lightest element
  3. 6. The units of weight
  4. 7. The process which occurs in main sequence stars
  5. 9. The birthplace of stars
  6. 11. The particle which orbits the nucleus of an atom
Down
  1. 1. The biggest planet in the solar system
  2. 2. An object which orbits another object in the solar system
  3. 5. A star the size of the Sun becomes this once hydrogen starts running out
  4. 8. The particle inside the nucleus which has no charge
  5. 10. The planet closest to the Sun