Across
- 2. The planet closest to the Sun.
- 3. The red planet, which scientists study to find life.
- 5. A planet or place where life can exist.
- 7. A large system of stars, planets and space dust.
- 8. A deep hole on the surface of the Moon or a planet.
Down
- 1. The largest planet in our solar system.
- 4. A living creature from another planet.
- 6. A tool scientists use to see stars and planets more clearly.
- 7. The force that pulls objects towards the Earth.
- 9. A machine used to travel into space.