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