The supermassive black hole could be being dragged along by an invisible partner. (Image credit: Sloan Digital Sky Survey (SDSS)) A supermassive black hole is racing across the universe at 110,000 mph (177,000 km/h), and the astronomers who spotted it don’t know why. The fast-moving black hole, which is roughly […]

AP/Terrance Siemon The three recent appearances (and two subsequent removals) of “monoliths” in Romania, Utah and California are intriguing examples of what can capture the public’s imagination. These constructions are metallic-looking structures about three or four metres tall, with a simple geometric design and reflective surface. They’ll look familiar to fans of […]

The Confederate submarine H.L. Hunley sank in 1864 and wasn’t seen again until 1995. Since 2000, conservators have worked tirelessly to reveal the doomed sub’s secrets. Credit: Bruce Smith/AP/REX/Shutterstock The Confederate submarine H.L. Hunley was a 40-foot-long (12 meter) sausage of bulletproof iron built in Mobile, Alabama, and propelled through […]