Astronomers have spotted something remarkable hiding in the depths of the Milky Way—a nearly perfect circle formed from the debris of an exploded star. Known as Teleios, from the Greek word meaning ...

Venus dominates the dawn sky. She reaches greatest western elongation, 46 degrees ahead of the rising sun, on June 1, and ...

There's no shortage of round celestial objects in our universe. Planets, moons and stars all exhibit lovely spherical shapes.