Across
- 1. It is a dwarf planet in the Kuiper belt.
- 4. It is a massive ball made mostly of hydrogen and helium.
- 6. Earth's closest neighbor in the solar system.
- 7. It is covered in swirling cloud stripes. It has big storms like the Great Red Spot.
- 9. It has a solid surface that is covered with craters like our Moon.
Down
- 2. It is one of two ice giants in the outer solar system and the third largest planet in our solar system.
- 3. It is known as the Red Planet.
- 5. It's made of a thick soup of water, ammonia, and methane over an Earth-sized solid center.
- 8. Water covers about 70% of this planet's surface.