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Across
  1. 5. - Complexly intricate (nine)
  2. 6. - Epic journey of a Greek hero (seven)
  3. 8. - Intense happiness (eight)
  4. 9. - Brightest objects in the universe (six)
  5. 10. - Sequence starting with 0, 1 (nine)
  6. 13. - Surreally oppressive complexity (ten)
  7. 16. - Seismic sea wave (seven)
  8. 17. - Guardian with a lion's body (six)
  9. 18. - Reminder of the past object (seven)
  10. 19. - Percussion of wooden bars (nine)
Down
  1. 1. - Medieval chemistry's precursor (seven)
  2. 2. - Opposite of utopia (eight)
  3. 3. - Gentle, breezy wind (six)
  4. 4. - Narrow sea inlet (five)
  5. 7. - Viewer of beautiful forms (twelve)
  6. 8. - Highest peak on Earth (seven)
  7. 11. - Deadly poison (seven)
  8. 12. - Composer deafened by fate (nine)
  9. 14. - Physics at the smallest scale (six)
  10. 15. - Whirlpool's bigger cousin (six)