Across
- 2. a force of attraction between all objects
- 5. devices that make far away objects seem closer
- 7. the Sun and all objects in orbit around it
- 8. any object that moves in orbit around another, larger body
- 10. curved pieces of glass
- 12. the four inner most planets, made of rock
- 14. smaller pieces of asteroids
- 16. the tendency of a moving object to keep moving in a straight line
- 17. large chunks of rock or metal in space
- 19. our galaxies nearest neighbor
- 20. an object orbiting the Sun that is mostly ice mixed with rock and dust
- 21. a sphere of hot gases that gives off light and heat
- 22. a slightly flattened circle, or oval
Down
- 1. the distance light travel's in one year
- 3. a meteoroid in Earth's atmosphere
- 4. a group of stars that make a pattern in the sky
- 6. a meteor that reaches Earth's surface
- 9. people who go into space
- 11. round objects in space that are satellites of the Sun
- 13. the outer planets, made mostly of gases
- 15. an unmanned spacecraft that leaves Earth's orbit
- 18. large groups of stars in the universe