The temperature of Cygnus X-1 from Hawking radiation is roughly a billionth of a degree above absolute zero.
Lower-mass black holes, such as Cygnus X-1, are the remnants of very massive stars; those are a story for another day.
Near Vega is another important constellation, known as the Swan or Cygnus.
Cygnus, who was a poet, celebrated the death of his friend in verse, from whence the fable.
McGuire is taking us straight toward Cygnus at two gees and won't stop.
I was looking at that ring in the constellation of Cygnus, being drawn there with persistence by some irresistible instinct.
He told her that the Milky Way was at its best these coming months, and that Cygnus would be always visible on clear nights.
In 1876 a temporary star appeared in the constellation Cygnus, and attained at one time the brightness of the second magnitude.
Circles of four degrees radius include respectively seven in Argo, eight in Cygnus.
The central nucleus he locates in the rich Galactic region of Cygnus, with the sun well outside the nucleus itself.