space cryptic crossword

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Across
  1. 4. No limits, in fine time forever
  2. 6. A song i wrote about a pen
  3. 10. Man in space that may contain nuts
  4. 12. Married girl named Astrun
  5. 13. Beginning of snake with speed
  6. 15. World of a broken heart
  7. 16. Beginning of sticky, a black substance
Down
  1. 1. Another boat in the sky?
  2. 2. Galaxy with a dairy route?
  3. 3. Large explosion
  4. 5. One-part of a song
  5. 7. Beginning of many a respirating student
  6. 8. Planet of love?
  7. 9. More than one toe
  8. 11. A hearing male child
  9. 14. The scheme of the extra terrestrial