11th one

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Across
  1. 3. - Inflatable seaside toy
  2. 6. - Valuable hidden bounty
  3. 7. - Coastal navigation aid
  4. 8. - All of space and time
  5. 9. - Eye protection from the sun
  6. 12. - Captured visual image
  7. 16. - Outdoor flame for warmth
  8. 19. - Transparent painting technique
  9. 21. - Romantic post-wedding trip
  10. 22. - Stargazing scientist
  11. 23. - Larval stage of a butterfly
  12. 24. - Exciting and daring journey
Down
  1. 1. - Exciting journey or quest
  2. 2. - Bright, sun-facing garden bloom
  3. 3. - Delicate, winged insect
  4. 4. - Juicy, refreshing fruit
  5. 5. - Device for cosmic observation
  6. 10. - Celestial nighttime radiance
  7. 11. - Explosive displays of light
  8. 13. - Common yellow wildflower
  9. 14. - Scientific magnification tool
  10. 15. - Multicolored meteorological phenomenon
  11. 17. - Agile flying insect
  12. 18. - Pertaining to hot, humid climates
  13. 20. - Tropical, spiky fruit