Across
- 1. constellation in Northern hemisphere
- 3. 8th planet also name of Roman god of the sea
- 5. Soviet satellite
- 6. center of something
- 7. dwarf planet
- 8. gas around an object in space
- 10. a ball of gas like the Sun
- 13. a person trained to pilot or serve as a member of spacecraft
- 16. mass of rock in space
- 17. gravitational force
- 18. first spaceworthy Space Shuttle in NASA
- 20. astronomical object with high energy
- 21. when rocket leaves launch pad
- 23. 2nd planet 4th smallest planet
Down
- 2. between planets
- 4. something that causes improvement
- 6. outermost part of the Sun's atmosphere
- 9. A device that orbits planets
- 11. small rocks that revolve around the Sun and are smaller than planets
- 12. a large hole on a surface
- 14. path of a planet, satellite, or moon
- 15. speed at which something moves or happens
- 17. group of stars, gas, and dust also plates that belong in the universe
- 19. 3rd planet only planet that supports life
- 22. to stretch or extend something