Across
- 3. Makes up 99% of all the mass in the solar system
- 5. Planet that orbits a star other than our sun
- 7. One revolution around the sun
- 9. Closest planet to the sun
- 10. Known as the "North Star"
Down
- 1. A cloud of gas and dust in space
- 2. Planet most similar to earth
- 4. Celestial body made of hot gasses, mainly H and He
- 6. A small rocky body orbiting the sun
- 8. The most inner part of the sun