Titan is 3,200.051 miles in diameter. It the second-largest moon out of hundreds in the solar system and is Saturn's largest. Titan's mass is 80 percent greater than that of the Earth's moon, and its diameter is 50 percent longer than the diameter of the Earth's moon.
An ice and rock surface also make it dense. Titan's atmosphere is about 370 miles high; along with its size, Titan has been studied a lot by astronomer's because its atmosphere and surface mirror Earth's much more closely than Saturn, which is a gas planet. Titan has large bodies of surface liquid, which are vital to sustaining life.