Although Saturn's largest moon, Titan looks like a hazy orange ball made of tiny droplets of hydrocarbons along with other, more noxious chemicals, it is the only moon in our solar system with a serious atmospheret. This atmosphere comes complete with lightning, drizzle and occasionally a big, downpour of methane or ethane-hydrocarbons.
Now, NASA's Cassini spacecraft has revealed thin, wispy clouds of ice particles, similar to Earth's cirrus clouds, according to Carrie Anderson and Robert Samuelson at NASA's Goddard Space Flight Center. The findings, published this week in the journal Icarus, were made using the composite infrared spectrometer on NASA's Cassini spacecraft.
"This is the first time we have been able to get details about these clouds," says Samuelson, an emeritus scientist at Goddard and the co-author of the paper. "Previously, we had a lot of information about the gases in Titan's atmosphere but not much about the [high-altitude] clouds."
Compared to the puffy methane and ethane clouds found before in a lower part of the atmosphere by both ground-based observers and in images taken by Cassini's imaging science subsystem and visual and infrared mapping spectrometer, these clouds are much thinner and located higher in the atmosphere.
"They are very tenuous and very easy to miss," says Anderson, the paper's lead author. "The only earlier hints that they existed were faint glimpses that NASA's Voyager 1 spacecraft caught as it flew by Titan in 1980."
The Daily Galaxy via JPL/NASA http://www.jpl.nasa.gov/index.cfm