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The Headphone Nebula, formally designated Jones-Emberson 1, is a faint planetary nebula located in the northern constellation Lynx. Discovered in 1939, it spans approximately four light-years across and possesses a central white dwarf star. Its common name derives from its distinctive headphone-like...
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Campbell's Hydrogen Star is the central star of a compact planetary nebula in the constellation Cygnus. It was noted in connection with the spectral work of W. W. Campbell in 1893, and the surrounding nebula is associated with the catalog designation PK. The object is studied as an evolved star whos...
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Scientifically unusual compact planetary nebula, historically notable spectrum, but niche and visually modest versus famous showpieces.
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