Caption An animation showing the Cygnus X-1 system, consisting of a black hole in orbit with a giant star. Recent observations by radio telescopes have found the system is 20 per cent further away ...

What Was the First Black Hole Ever Discovered? The first accepted black hole was Cygnus X-1. Discovered during a 1971 rocket flight, Cygnus X-1 is one of the strongest X-ray sources detectable ...

If a star orbits a black hole, it will appear from a distance to be orbiting empty space. Gaia projects the star’s orbit on a ...