a five-planet system about 500 light-years from Earth in the constellation Cygnus. The five planets of Kepler-186 orbit a star classified as a M1 dwarf, measuring half the size and mass of the sun.

Known as Wolf 1069 b, the planet orbits a red dwarf star called Wolf 1069, which is about the fifth the size of our Sun. It’s only 31.2 light-years distant in the constellation of Cygnus.

The danger to forming planets in densely packed star clusters like Cygnus OB2 comes from high-energy ultraviolet and X-ray radiation blasted out in excess by massive infant stars. This radiation ...

Over three decades ago, Stephen Hawking placed -- and eventually lost - a bet against the existence of a black hole in Cygnus X-1. Today, astronomers are confident the Cygnus X-1 system contains a ...

Accretion occurs at super-Eddington rates; the apparent luminosity makes Cygnus X-3 an ultraluminous X-ray source. See Veledina et al. A warm Earth-sized planet ready for characterization ...