Across
- 4. The explosion that started the Universe
- 6. A system that includes the Sun, planets, and other celestial objects
- 9. Our home planet
Down
- 1. The galaxy that contains our solar system
- 2. A place with mostly empty space but full of stars and planets
- 3. A huge group of stars, gas, and dust held together by gravity
- 5. The natural satellite of Earth
- 7. A massive ball of hot gas that produces light and heat
- 8. The star at the center of our solar system