Scientists have proposed that advanced alien civilizations could build a Dyson sphere around a black hole instead of a star.

One of the most powerful objects in the universe is a radio quasar — a spinning black hole spraying out highly energetic particles. Come too close to one, and you'd get sucked in by its gravitational ...

Remember when I warned everyone that humans would probably destroy all life in the universe like construction workers killing ant colonies to make way for a never-ending series of cosmic strip malls?

High in the Peruvian Andes, a serrated stripe of pits cuts across a barren hillside, so regular and extensive that early ...