Across
- 1. everything that exists
- 5. our Milky Way galaxy
- 9. a massive system of stars, gas, and dust, all held together by gravity
- 10. uses mirrors and computerized motors to make observations
- 14. allows humans to escape Earth's atmosphere and its gravity
- 16. rotating disc of young stars, gas, and dust with the center bulge consisting of older stars
- 18. to spin or turn like a top
- 19. terrestrial (land) planets that are closest to the sun
- 20. gas giants that are farther from the sun
Down
- 2. perfect sphere of flattened globe, brightest at the center
- 3. to travel around something
- 4. study of everything in space
- 6. remote controlled vehicle used to explore
- 7. station used by humans to study space and its effects
- 8. space probe that travels into our solar system and sends signals back to Earth
- 11. giant hot ball of gas that produces its own heat and light
- 12. has no particular shape
- 13. space probe travels deep into space to collect information
- 15. the path an object takes around other objects in space
- 17. nearly round bodies who's path crosses that of another planet