Astronomers have discovered an ultracool dwarf binary system - 2 very low-mass stars orbiting closely - completing an orbit in less than an earthly day.
Do we need to drill through miles of ice to find life on Enceladus? A new study says a simpler strategy is to just re-analyze the moon's water vapor plumes.
Black holes are time machines for traveling into the future and the past. But it's not quite so simple. Read more about the rules of time travel in black holes.
2 new research papers debate whether Jupiter's moon Io has a magma ocean or a hot metal core. The results were presented at the AGU22 meeting this month.