A magnetar is the collapsed core of a massive star, compressed into a sphere roughly the size of a city and threaded by an extraordinarily strong magnetic field. Its matter is so dense that familiar ...

There is a literal fault in our stars. Astronomers may have stumbled onto a bizarre cosmic object that appears to be part black hole, part star, and is so ridiculously energetic that it outshines its ...

There's a question at the heart of SETI that doesn't get nearly enough attention. It isn't whether aliens exist, and it isn't whether we have the technology to detect them. It's a far more practical ...