Biosphere's song Cygnus-A, The Mars Volta's song Cygnus .... Vismund Cygnus, the Cygnus X-1 duology by Rush, and throughout The Lonely Forest's concept album Nuclear Winter, all include references to Cygnus.

Examples of binaries are Sirius and Cygnus X-1 ( of which one member is probably a black hole ).

Probably the best known example of an X-ray binary at present is the high-mass X-ray binary Cygnus X-1.

In Cygnus X-1, the mass of the unseen companion is believed to be about nine times that of our sun, far exceeding the Tolman-Oppenheimer-Volkoff limit for the maximum theoretical mass of a neutron star.

* 1971 — Identification of Cygnus X-1 / HDE 226868 as a binary black hole candidate system

Cygnus X-1 ( abbreviated Cyg X-1 ) is a well-known galactic X-ray source in the constellation Cygnus.

Cygnus X-1 was the first X-ray source widely accepted to be a black hole candidate and it remains among the most studied astronomical objects in its class.

Cygnus X-1 belongs to a high-mass X-ray binary system about from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0. 2 AU, or 20 % of the distance from the Earth to the Sun.

This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than.

Cygnus X-1 was discovered using X-ray instruments that were carried aloft by a sounding rocket launched from White Sands Missile Range in New Mexico.

As a result of these surveys, eight new sources of cosmic X-rays were discovered, including Cyg XR-1 ( later Cyg X-1 ) in the constellation Cygnus.

Extended Uhuru observations of Cygnus X-1 showed fluctuations in the X-ray intensity that occurs several times a second.

In April – May 1971, Luc Braes and George K. Miley from Leiden Observatory, and independently Robert M. Hjellming and Campbell Wade at the National Radio Astronomy Observatory, detected radio emission from Cygnus X-1, and their accurate radio position pinpointed the X-ray source to the star AGK2 + 35 1910 = HDE 226868.

Hence, the star must have a companion that could heat gas to the millions of degrees needed to produce the radiation source for Cygnus X-1.

With further observations strengthening the evidence, by the end of 1973 the astronomical community generally conceded that Cygnus X-1 was most likely a black hole.

More precise measurements of Cygnus X-1 demonstrated variability down to a single millisecond.

This X-ray image of Cygnus X-1 was taken by a balloon-borne telescope, the High Energy Replicated Optics ( HERO ) project.

Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.

Cygwin was originally developed by Cygnus Solutions, which was later acquired by Red Hat.

The name was changed to Cygwin32 to emphasize Cygnus ' role in creating it.

By 1996, other engineers had joined in, because it was clear that Cygwin would be a useful way to provide Cygnus ' embedded tools hosted on Windows systems ( the previous strategy had been to use DJGPP ).

From 1990 to 1993 it was maintained by John Gilmore while he worked for Cygnus Solutions.

Cygnus Solutions, originally Cygnus Support, was founded in 1989 by John Gilmore, Michael Tiemann and David Henkel-Wallace to provide commercial support for free software.

Cygnus was also the original developer of Cygwin, a POSIX layer and the GNU toolkit port to the Microsoft Windows operating system family, and of eCos, an embedded real-time operating system.

In the 2001 documentary film Revolution OS, Tiemann indicates that the name " Cygnus " was chosen from among several names that incorporated the acronym " GNU ".

The Black Swan was a literary or artistic image, even before the discovery of Cygnus atratus.

The first released was The Beginning, containing excerpts from The Way Back, Spacefall, Cygnus Alpha and Time Squad.

Servius also writes of Cycnus as a musician and a lover of Phaethon, and states that he was changed into a swan and later was placed among the stars by Apollo ( that is, as the constellation Cygnus ).

According to Pseudo-Eratosthenes and Hyginus ' Poetical Astronomy, the constellation Cygnus was the stellar image of the swan Zeus had transformed into in order to seduce Leda or Nemesis.

Past analysis of data from the space-based Chandra X-ray Observatory suggested that Cygnus X-1 was not rotating to any significant degree.

Strife was originally being developed by Cygnus Studios, the creators of Raptor: Call of the Shadows, for id Software.

This was a £ 1 million pound project designed to benefit the habitats of species such as Water-crowfoot, Atlantic salmon, Brook lamprey, Sea lamprey, bullhead, Desmoulin's whorl snail, Gadwall and Cygnus columbianus Berwick's swan.

One of the most famous high-mass X-ray binaries is Cygnus X-1, which was the first identified black hole candidate.

Uhuru achieved several outstanding scientific advances, including the discovery and detailed study of the pulsing accretion-powered binary X-Ray sources such as Cen X-3, Vela X-1, and Her X-1, the identification of Cygnus X-1, the first strong candidate for an astrophysical black hole, and many important extragalactic sources.

Others believe the Arrow to be the one shot by Hercules towards the adjacent Stymphalian birds ( 6th labor ) who had claws, beaks and wings of iron, and who lived on human flesh in the marshes of Arcadia-Aquila the Eagle and Cygnus the Swan, and the Vulture-and still lying between them, whence the title Herculea.

The similarities between the emissions of X-ray binaries such as HDE 226868 / Cygnus X-1 and active galactic nuclei suggests a common mechanism of energy generation involving a black hole, an orbiting accretion disk and associated jets.

It is located between Cygnus, Cassiopeia and Andromeda on the northern celestial sphere.

The Perseus Spiral Arm, with a radius of approximately 10, 700 parsecs, is located between the minor Cygnus and Carina – Sagittarius Arms.

It was located in a region between the constellations Cepheus, Andromeda, Cassiopeia and Cygnus.

One end was near the shoulder of Ophiuchus and the other was near Pegasus, and in between it passed through the area now occupied by Vulpecula, flowing between Cygnus and Aquila.

* In 1975, cosmologist Stephen Hawking bet fellow cosmologist Kip Thorne a subscription to Penthouse magazine for Thorne against four years of Private Eye for him that Cygnus X-1 would turn out not to be a black hole.