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The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
About this image. The Ring Nebula, M57, NGC6720. This true color picture was taken using Ektachrome film at the prime focus of the Kitt Peak 4m telescope on September 1st 1973. This is unusual: normally color images are made by combining black and white images taken through different colored filters. The Ring Nebula, also known as M57 or NGC 6720, is found in the constellation Lyra. A spherical shell of glowing gas surrounds a central hot star. The nebula was formed when the central star ejected perhaps as much as ten percent of its mass, over a period of some millions of years.