Horsehead Nebula, also known as Barnard 33 and LDN 1630, is a dark nebula located inside Orion Constellation. Horsehead Nebula has a mass of 250 Solar Masses and a radius of 3.5 Light Years. Horsehead Nebula is 1375 Light Years from Earth. Horsehead Nebula was discovered in 1888 by Scottish Astronomer Williamina Fleming.
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