What travels almost one-fifth the velocity of light and erupts from the heart of a galaxy? For the very first time, astronomers have just watched it happen-the birth of an ultrafast outflow, or “UFO,” ...

Deep under the Antarctic ice, instruments built to catch ghostly particles have stumbled on something stranger than anyone ...

A new warp-drive study proposes a novel segmented design that brings hyper-fast space travel one step closer to becoming a ...

Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

A never-before-seen blast from a supermassive black hole was spotted by two sophisticated X-ray space telescopes. This giant ...

Astronomers have spotted the longest gamma-ray burst ever seen, a cosmic explosion that lasted seven hours — and they ...

A sudden X-ray flare from a supermassive black hole in galaxy NGC 3783 triggered ultra-fast winds racing outward at a fifth the speed of light—an event never witnessed before. Using XMM-Newton and ...

Aliens might be transmitting communications signals to each other across exoplanets, some astronomers think. Since these ...