The Cygnus X-1 system consists of a black hole with a mass about 10 times that of the Sun in a close orbit with a blue supergiant star with a mass of about 20 Suns.

We now know Cygnus X-1 contains a black hole and a star in a binary system. The star is also classified as the variable star V1357 Cygni, a hot supergiant (think Rigel) with an O9.7 spectral ...

Cygnus X-1 began as a star that was approximately 60 times the sun's mass that collapsed tens of thousands of years ago. It orbits a companion star every five and a half days at one-fifth of the ...

The band's classic multi-movement opus "Cygnus X-1" took on all comers in our Rock Star Wars tournament, soaring through our carefully arranged series of intergalactic battles between 32 space ...

The competition is getting fierce as Rush's deep-space magnum opus "Cygnus X-1" goes head-to-head against Styx's "Come Sail Away" in this round of our Rock Star Wars tournament. To try and fill ...

Weighing in at roughly 21 solar masses, the black hole in the X-ray binary system Cygnus X-1 is so massive that it challenges current stellar evolution models, a new study reveals.

New observations of its distance from Earth have shown that Cygnus X-1, the first black hole ever discovered, is much more massive than previously estimated. In fact, it's the most massive black ...

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 than ...

New observations of the black hole inside the binary star system Cygnus X-1 helped astronomers piece together a more complete understanding of this black hole than any other in the galaxy.

Cygnus X-1 (also called Cyg X-1) is one of the most famous black holes in our galaxy. It is the first source that astronomers could agree was a black hole, and the subject of a well-known 1974 bet ...

A stunning new image from Europe's Herschel space observatory shows the star-forming region Cygnus-X, which is found about 4,500 light-years from Earth.