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 ...

This proportion of disk-encircled stars dropped to 18% in regions of the star cluster with more X-ray and ultraviolet ... effect in Cygnus OB2 was found within a region around 1.6 light-years ...