Cygnus is one of the most well-known constellations in the northern summer and fall and has a prominent asterism called the Northern Cross.
This feature is so prominent that the entire constellation is also known as the "Northern Cross."
Cygnus is one of the 88 "official" constellations that are visible today.
It was one of the 48 constellations that the 2nd-century astronomer Ptolemy recorded.
Forming one corner of the Summer Triangle and one of the brightest stars in the night sky, the star Deneb is found in Cygnus.
A few noteworthy X-ray sources, including the massive star association Cygnus OB2, are also found in Cygnus.
The constellation is also home to one of the biggest stars currently known, NML Cygni.
Cygnus X-1, a far-off X-ray source with an undetected huge supergiant companion and which was the first object that is widely believed to be a black hole, is likewise located in the constellation.