Nearby Nebulae
The rear of The Great Dark Horse (its rump and hind legs), is also known as the Pipe Nebula, which itself carries the designation B77, B78, and B59. (The 'B' numbers named after the astronomer Edward Emerson Barnard, who catalogued dark nebulae.) The Snake Nebula extends from the Dark Horse to the Rho Ophiuchus nebulosity .
The ability to see The Great Dark Horse with the naked eyes is an indication that the skies are very dark, i.e. not affected by (urban and industrial) light pollution.
Read more about this topic: Dark Horse (astronomy)
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