Across
- 3. One theory to describe how the universe was created
- 4. Shape of our galaxy
- 7. Gases surrounding the planet
- 9. Fastest traveling thing in space
- 10. Study of the universe
- 12. Closest planet to the sun
- 13. Amount of planets in our solar system
Down
- 1. Orbits the sun but not big enough to be a planet
- 2. Biggest star in our solar system
- 5. Name of our planet
- 6. Cold and windy planet
- 8. A rocky object orbiting the earth that is smaller than a planet
- 11. Opposite of day
- 12. The name of our galaxy