Astronomers have discovered an ultracool dwarf binary system - 2 very low-mass stars orbiting closely - completing an orbit in less than an earthly day.
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.
Members of the EarthSky community - including scientists, as well as science and nature writers from across the globe - weigh in on what's important to them.