1. Chapter 13
Uranus, Neptune and Pluto

3. Uranus
The planet's axis of rotation lies almost in the plane of its orbit.
The surface of this planet is almost featureless and has a blue-green color caused by methane clouds.

5. Uranus Uranus has many thin ice rings.
Uranus was visited by Voyager 1 and 2 in the 1980's.

6. Uranus Uranus has many thin ice rings.
Uranus has 15 moons of which only 5 can be seen from Earth-based telescopes.
Uranus was visited by Voyager 1 and 2 in the 1980's.

7. Uranus
Uranus has 15 moons of which only 5 can be seen from Earth-based telescopes.

9. Neptune
Neptune was predicted to exist due to perturbations in the orbit of Uranus. Neptune was discovered in 1846.
Neptune also has a blue-green color caused by methane clouds on the surface.
Neptune has a Great Dark Spot similar to Jupiter's Great Red Spot.

10. Neptune
Neptune captured most of its 8 moons. Triton is Neptune's largest moon.
Neptune was visited by Voyager 2 in 1989.

12. Pluto and Charon Pluto was discovered in 1930 by Clyde Tombaugh.
The Pluto-Charon system is more like a pair of ice planets.
Both Pluto and Charon have synchronous rotation.

13. e a c d b Matching 1. Reddish color of Mars
2. Red-orange color of Jupiter's belts
3. Venus' yellowish clouds
4. Blue-green color of the surface of Uranus and Neptune
5. The yellow and orange color of Io
a. ammonia clouds
b. sulfur powder
c. sulfuric acid clouds
d. methane clouds
e. iron a c d b

14. End of Section.