Really hard crossword

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Across
  1. 4. Salty taste and has a lot of different fish
  2. 5. After death, or post ______
  3. 8. ...
  4. 9. Colorful gem first found in Germany
  5. 10. Spanish ship used between the 15th and 17th century
  6. 13. You could describe this clue as one: "The answer to the 'aurum' in latin question starts with the same two letters as the theorem 'a^2 + b^2 = c^2'"
  7. 16. Plural form of the remnants of perished stars
  8. 18. Some might say upon seeing another
  9. 19. Slightly off; not straight
  10. 21. The answer to this clue
  11. 23. Like a snake does to its skin
  12. 24. This crossword, as stated
  13. 25. Something a really sharp note might give you
  14. 28. Fools call it "aurum" in latin
  15. 29. If Earth was our mother, this would be our aunt
  16. 30. Dwarf planet far out into the outer reaches of the solar system
Down
  1. 1. Colloquial term for the time period between WW1 and The Great Depression that sure is loud
  2. 2. Be there or be _____________
  3. 3. "One" in "a million"
  4. 6. Very common volcanic rock
  5. 7. Greek goddess of love
  6. 11. Vehicle that is a combination of all the planet/Dwarf planets first letters in this crossword
  7. 12. Something that contradicts itself that also does not contradict itself at all
  8. 14. The time directly between yesterday's lunch and tomorrow's lunch
  9. 15. A game that has been around for over a decade, yet has not gotten any updates in years
  10. 17. The study of words and their origins
  11. 20. There's no way this is the right ____
  12. 22. Walled medieval fortress or town
  13. 26. In the Hitchhiker's Guide to the Galaxy, this is the most important item you can bring with you. (Don't throw it in!)
  14. 27. Planet that has moons such as "Caliban" and "Titania"