NGC 6572, the Emerald or Green Nebula in Ophiuchus, is a bright, compact planetary nebula glowing blue-green in summer skies—best seen with a telescope.. You can even see hints of green in the Lagoon Nebula picture above. Using a filter that picks up green (sulfur) emission , the astronomers ferreted out a bit of emerald.
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NGC 6572 is a planetary nebula in the constellation Ophiuchus. It was discovered in 1825 by the German astronomer Friedrich Georg Wilhelm von Struve. According to several sources such as Sky & Telescope, this object received the nicknames Blue Racquetball, Emerald Nebula, Green Nebula, and Turquoise Orb. [citation needed] At magnitude 8.1, NGC 6572 is easily bright enough to make it an.. Planetary nebulae are a type of emission nebula created from the ejected gas of dying red giant stars. [1] The following is an incomplete list of known planetary nebulae.
