Cassini watched bright “islands” appear, disappear and reappear in Titan’s methane seas — and laboratory experiments suggest they may be fields of nitrogen bubbles fizzing out of solution as the alien lakes warm or mix

Cassini’s radar saw bright features appear within Titan’s dark northern seas, vanish on later passes and, in one region, return in a changed form. They were nicknamed “magic islands”, but the observations never established that they were islands or even solid…