Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Just below Deneb lies the suggestively shaped North American emission nebula. Deneb is the brightest star in the constellation Cygnus , located in the tail of this celestial swan . Deneb defines the top of the Northern Cross while the body of the cross extends past the upper right corner of the picture. Cygnus also harbors the most famous candidate for a black hole in our galaxy, Cygnus X-1 .
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