Across
- 2. A planet that is close to earth.
- 3. The planet that we live on.
- 4. A former planet of our solar system.
- 5. The first planet in our solar system.
- 7. the study of space.
- 10. The closest star.
Down
- 1. an object that helps people communicate over long distances.
- 6. unidentified flying object.
- 8. A tool used to look at space.
- 9. An object in space that goes around a planet.