Across
- 1. the distance light can travel in one year
- 4. a machine that moves around a planet to send signals or take pictures
- 5. a huge collection of stars, planets, and space dust
- 7. a big round object in space that moves around a star
- 8. the invisible path an object follows around a bigger object in space
Down
- 2. the force that keeps things from floating away
- 3. a person who explores space in a special suit and spacecraft
- 6. everything in space, including stars, planets, and galaxies