Across
- 2. Closest planet to Earth.
- 5. The first man on the moon.
- 7. Our galaxy.
- 8. Jupiter has 63 of these, Neptune has 14, and Earth only has 1.
- 10. The dwarf planet in our solar system.
Down
- 1. Earth's sister planet.
- 3. A luminous ball of gas held together by its own gravity.
- 4. The innermost and smallest planet.
- 6. Inhabitants of Mars.
- 9. Planets do this around the Sun.