Across
- 4. Not smooth or even in shape.
- 6. Related to the very cold areas near the North or South Pole.
- 9. A building with glass walls and a roof that keeps plants warm.
- 11. Very tiny pieces that make up everything around us.
Down
- 1. To join or melt together.
- 2. A shape that curves around and around, like a coil or a galaxy.
- 3. A way to measure very large distances in space.
- 5. really large and Having to do with space, stars, and planets.
- 7. The United States space agency that studies space and sends astronauts and spacecraft into space.
- 8. Very cold.
- 10. A group of things close together.