A new theory suggests black holes may not have singularities but act as portals, possibly leading to white holes. If true, it ...

While the LIGO detections involved collisions between black holes only a bit more massive than the sun, the gravitational waves responsible for this background hum are thought to result from ...

Einstein's theory of general relativity suggests that the "memory" of ancient events, such as black hole mergers, may be etched into the fabric of space-time by gravitational waves. New research ...