The Solar System

4. This planet has such a dense, dangerous atmosphere that is makes it hard for us to see any surface features.
5. The area near the sun where life can exist.
6. A huge hurricane that has been raging for centuries on Jupiter.
7. Planets that are gaseous in composition.
9. The largest volcano on Mars
12. This planet's atmosphere is mostly methane which gives is a blue appearance.
14. The planet has the lowest density, even given its large size.
16. Planets that are rocky in composition.

1. This planet appears to be rotating on its side because its axis is tilted parallel to its orbital plane.
2. Spacecraft that left earth in 1977 to explore the outer planets.
3. This planet has the most moons revolving around it.
5. The trapping of solar radiation due to gas.
8. The spacecraft launched in 1997 whose mission was to explore Saturn.
10. This planet appears to have one side always facing the sun.
11. The scientist who discovered Uranus in 1781.
13. This planet has surface features that suggest that water once existed.
15. Third planet from the sun.