Beneath its dreary shroud of clouds, Venus could be positively hopping: Planetary geologists have spotted a lava flow they say is just decades old. If confirmed, it would be the youngest evidence for volcanism on Venus.

Some researchers believe that Venus is geologically active, since more than 1,000 volcanoes dot its surface but definitive evidence that the planet is active today, like Earth, and not long dead, like Mars, has been elusive.