In September 2010, NASA’s Cassini spacecraft observed liquid falling on the equatorial deserts of Saturn’s largest moon, Titan – this was equivalent to early April in Titan’s year.
When rain falls in Spain
It all falls* on the plain,
And (in Spanish) they say, “Look, it’s raining!”
But they shouldn’t complain
Of their watery rain,
For on Titan they’d say, “It’s methaning!”
* (mainly)