Across
- 2. without any people
- 4. to be studied
- 5. a large object that moves around a sun
- 7. a vehicle used for travelling in space
- 8. the force that pulls things to other things
- 9. space and everything in it
Down
- 1. facts, information, and skills learned
- 3. a person who is trained to travel in a spacecraft
- 6. a guess about what might happen