Solar System
Across
- 3. surface is made of water ice and so it reflects 5.5 times the sunlight than our Moon does
- 4. the age is 13.6 billion years (and counting)
- 6. the fast is planet, zipping around the Sun every 88 Earth days
- 7. estimated to contain between 1.1 and 1.9 million asteroids larger than 1 kilometer (0.6 miles) in diameter, and millions of smaller ones.
- 10. the largest of Pluto's five moons
- 12. A day on it 153 hours
- 14. it spins slowly in the opposite direction from most planets
Down
- 1. makes a complete orbit around the Sun (a year in Martian time) in 687 Earth days
- 2. the biggest planet
- 5. one of the largest structures in our solar system
- 6. the earth's natural satellite
- 8. the earth's biggest heat source
- 9. the second-shortest day in the solar system
- 11. is the only planet in our solar system not visible to the naked eye
- 13. the first planet found with the aid of a telescope.