An arc of emission just found in the Tycho supernova remnant provides evidence for what triggered the original explosion. Astronomers think that a shock wave created the arc when a white dwarf exploded and blew material off the surface of a nearby companion star.

Astronomers may be closer to knowing why some of the most massive stellar explosions ever observed occur in the tiniest of galaxies.

The hottest stars in the universe spin so fast that they get a bit squished at their poles and dimmer around their middle. The 90-year-old theory that predicts the extent of this "gravity darkening" phenomenon has major flaws, according to a new study led by University of Michigan astronomers.

Imagining exoplanets is tough, but imaging stars cirkling each other just as closely is even harder. Now astronomers have resolved a triplet star-system closer to each other than the orbit of Mars!