Transcript: Saturn's Titan is the second largest moon in the solar system. With a diameter just over 5,100 kilometers it is four times larger than the next largest of Saturn's moons, 40 percent of the diameter of Earth. Yet its pressure at the base of its atmosphere is 60 percent larger than the Earth's pressure, and its atmosphere is composed mostly of nitrogen like the Earth. But unlike the Earth, due to the large distance from the sun, Titan is very cold with a temperature of 95 Kelvin or -290 degrees Fahrenheit. The atmosphere appears as a featureless orange haze, much like a smog situation. In addition to nitrogen there are minor constituents of organic materials such as methane, ethane, acetylene, ethylene, and hydrogen cyanide. The pressure and temperature near the surface are at a place where methane can exist as a gas, a liquid, or a solid, and so it's likely that there's rain or snow of organic compounds and methane itself in the atmosphere. Scientists are virtually certain that there are liquid methane and ethane oceans or lakes on the surface of Titan, making it a very exciting world in the outer solar system for us to explore.