5

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Across
  1. 2. - Collection of stars (6 letters)
  2. 4. - Violent windstorm (7 letters)
  3. 6. - Small cake often topped with frosting (7 letters)
  4. 8. - Cascading stream (10 letters)
  5. 10. - Orchestral composition (8 letters)
  6. 11. - Characteristic of the tropics (8 letters)
  7. 15. - Long-distance running race (8 letters)
  8. 16. - Animals living in nature (8 letters)
  9. 17. - Juicy summer fruit (10 letters)
  10. 18. - Study of celestial objects (9 letters)
  11. 20. - Flying insect with transparent wings (9 letters)
Down
  1. 1. - Flowering tree or shrub (8 letters)
  2. 3. - All of space and everything in it (8 letters)
  3. 5. - Insect with colorful wings (10 letters)
  4. 7. - Large mammal with a trunk (8 letters)
  5. 9. - Sweet treat (9 letters)
  6. 12. - Ideal or perfect place (8 letters)
  7. 13. - Illumination from the moon (9 letters)
  8. 14. - Large mammal with a horn on its nose (10 letters)
  9. 19. - Name of the sun (7 letters)