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.