Across
- 3. when your view is blocked by a moon
- 6. a large cavity in the ground
- 8. viewing device for space
- 9. small rocky body orbiting the sun
- 10. layer of air above earth
- 11. force that keeps our feet on the ground
- 14. basic unit of an element
- 17. regular path around
- 19. a group of stars forming a recognizable pattern
- 20. a cloud of gas and dust in outer space
Down
- 1. a system of millions or billions of stars
- 2. half the globe
- 4. an artificial body placed in orbit around the earth
- 5. the rarefied gaseous envelope of the sun and other stars
- 7. person who goes into space
- 12. a small body of matter from outer space that enters the earth's atmosphere
- 13. the universe seen as a well-ordered whole
- 15. rock satellite of earth
- 16. a celestial object consisting of a nucleus of ice and dust
- 18. a celestial body moving in an elliptical orbit around a star