EarthWindow to hell: Io's strongest volcano changes face as we watch The moon of Jupiter is in an almost constant state of eruption - and its most persistent volcano, Loki Patera, keeps an unsteady rhythm News
EarthHow Planet Nine may have been exiled to solar system's edge If the giant planet announced this week actually exists, we can already explain how it got there - and how it solves a mystery about the worlds we see around other stars News