Titan: An Earth No. 2 waiting to be born
Titan, the deep-frozen moon of Saturn, is emerging as the most likely place in the solar system for new life to evolve, according to scientists who have been studying its atmosphere and surface chemistry. They found that Titan's atmosphere is drenched in a wide range of complex organic molecules very similar to those that gave rise to life on Earth billions of years ago. Although it is far too cold for life at present, this is likely to change because stars such as the sun expand and grow far hotter as they reach old age.