Across
- 3. flat, not standing up
- 4. having lots of muscles
- 10. empty inside
- 11. draw
- 16. every time
- 17. groups of stars
- 18. explain further
- 21. fast animal
- 22. building full of books
- 23. Mercury, Venus, etc
Down
- 1. times two
- 2. impact
- 5. not real
- 6. made from oil
- 7. inflate
- 8. more than one
- 9. comes after 10th
- 12. permitted
- 13. seafood
- 14. easily broken
- 15. between the stars
- 19. superlative for loud
- 20. very large mammal
- 21. strong wind