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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).
The Carina Nebula is a bright, large emission nebula surrounding the star Eta Carinae, located in the southern constellation Carina. It is also sometimes called the Eta Carinae Nebula, the Grand Nebula, or the Great Nebula in Carina. The nebulaâs designation in the New General Catalogue is NGC 3372. It is one of the largest diffuse nebulae known, one that contains several open star clusters.