Add Yahoo as a preferred source to see more of our stories on Google. An artist's impression of the accretion disk around the compact object in the X-ray binary system Cygnus X-3, showing the X-rays ...

It's quick and easy to access Live Science Plus, simply enter your email below. We'll send you a confirmation and sign you up for our daily newsletter, keeping you up to date with the latest science ...

The X-ray-emitting binary system Cygnus X-3 features a massive star donating matter to a compact object, probably a black hole. That may explain its perplexing brightness. When you purchase through ...