Across
- 3. An acronym for the International Space Station
- 6. The study off all things beyond Earth's atmosphere
- 8. The largest planet in the solar system
- 9. To travel around an object in space
- 10. The hottest planet in the solar system
Down
- 1. A collection of stars and planets held together by gravity
- 2. The distance it takes light to travel in a year
- 4. The planet farthest from the Sun
- 5. The force that keeps everything in the universe organized
- 7. The planet closest to the Sun