It may rain droplets of methane on Saturn's largest moon. New observations of Titan made in the infrared region of the spectrum have detected clouds of methane gas forming and dissipating in the upper reaches of its thick atmosphere. The clouds lasted about two hours and then faded away, probably because they condensed and showered the surface with methane rain.
Astronomers believe that Titan's atmosphere resembles Earth's, with clouds and rain.
There may even be seas on the satellite's surface. They will find out more in 2004 when the European-made Huygens spacecraft plunges into the moon's atmosphere. Titan is the only object in the Solar System with an atmosphere of comparable thickness and overall composition to that of our planet. Like Earth, its atmosphere is mostly nitrogen. It is very cold, however, with a temperature of about -180C. Titan as seen from the Voyager spaceprobe in 1979 Scientists speculate that instead of having a water cycle like our planet, a methane cycle would be the key component of Titan's weather.