砂時計星雲
1. Hourglass NebulaThe Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula situated in the southern constellation Musca about 8,000 light-years away 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). At the time, it was designated simply as a small faint planetary nebula.
Read “Hourglass Nebula” on English Wikipedia
Read “砂時計星雲” on Japanese Wikipedia
Read “Hourglass Nebula” on DBpedia
Read “Hourglass Nebula” on English Wikipedia
Read “砂時計星雲” on Japanese Wikipedia
Read “Hourglass Nebula” on DBpedia
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