Across
- 2. The force that pulls objects toward each other.
- 6. A round object that travels around a star.
- 7. To travel around another object in space.
- 8. SYSTEM The Sun and the objects that travel around it.
- 10. A vehicle that blasts off into space.
Down
- 1. A robot vehicle that explores a planet.
- 3. A tool for seeing faraway objects in space.
- 4. A hot ball of gas that gives off light and heat.
- 5. A person trained to travel into space.
- 9. An object that travels around a planet.