The idea that Titan is a wet world with its own alien waters is widely accepted by planetary scientists. Nothing else can account for the observations: NASA’s Cassini spacecraft has flown by Titan more than 90 times since 2004, pinging the Moon with radar and mapping its lakes and seas. ESA’s Huygens probe parachuted to the surface of Titan in 2005, descending through humid clouds and actually landing in moist soil.
Yet something has been bothering Alex Hayes, a planetary scientist on the Cassini radar team at Cornell University.
If Titan is really so wet, he wonders, “Where are all the waves?”