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Across 3. one complete orbit around the sun 4. moon moves between sun and Earth casts a shadow on the Earth 10. small rocky bodies 13. made of ice, rock and dust 14. part of the sun we see during an eclipse 16. dark, flat regions on the moon caused by hardened lava 19. force that keeps objects in orbit around the sun 20. the only star in our solar system 22. rocky bodies that enter earth's atmosphere 23. violent explosion of a star

Down 1. scientists who study space 2. explanation as to how the universe began 4. powerful eruptions of gas that occur near sunspots 5. Earth moves between the sun and the moon casting a shadow on the moon 6. where fusion occurs in the sun 7. layer of the sun that gives of the light we see 8. small object that strikes earth's surface 9. unit used to mearsure distance of objects in space 11. natural or artificial object that orbits another object in space 12. star that has used up all fo its helium in its core 15. the name of our galaxy 17. hydrogen atoms fuse into helium creating a release of energy 18. dark spots on the sun caused by lower temperatures 19. group of stars and interstellar matter 21. large cloud of gas and dust