Titan: the new Earth?
Images from orbit highlight striking similarities between Earth and Titan.
On the surface, Earth and Titan seem to share little kinship. Titan is 40 percent of Earth's diameter. It's colder, with temperatures plunging to 291° Fahrenheit (180° Celsius). And, of course, it's a moon, not a planet. However, on a more fundamental level, Earth and Titan show important similarities. Titan mimics many terrestrial processes and landforms common on Earth.