If you wanted lakefront property on Titan, the largest moon of Saturn, a lake known as Ligeia Mare might be a good place to look. It’s bigger than Lake Superior here on Earth, with almost 800 miles of shoreline. And it’s the middle of spring there — with another decade to go until the end of summer. There are a couple of drawbacks. The lake is chilled to hundreds of degrees below zero. And in recent months, the skies above it have gotten a little cloudy. Titan is the only world other than Earth that’s known to have a cycle where liquid forms clouds and rain, carves rivers, fills lakes, and evaporates back into the atmosphere. But Titan is so cold that water at its surface is frozen as hard as rock. So the liquid on Titan consists of ethane and methane. When the Cassini spacecraft arrived at Saturn a decade ago, it saw clouds over some of the lakes near Titan’s south pole, where it was late summer. Since then, the seasons changed and most of the clouds disappeared. Scientists had expect
