Dried up riverbeds carved by liquid methane

Both the Cassini spacecraft (at present in orbit around Saturn) and the Huygens spaceprobe (which landed on Titan in January of this year) have found evidence of dried up "riverbeds" that have the appearence of being carved by flash floods, probably of liquid methane, on this large moon of Saturn.



There is very recent speculation that these periodic floods occur every hundred years or so. So far, there is no evidence that any liquid is present on Titan's surface at present, although a lack of craters on the surface further suggests that liquids are a periodic feature of Titan.

Artists impression of the Hugyens landing: