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.. The NASA/ESA/CSA James Webb Space Telescope has observed the well-known Ring Nebula with unprecedented detail. Formed by a star throwing off its outer layers as it runs out of fuel, the Ring Nebula is an archetypal planetary nebula. The object is also known as M57 and NGC 6720, and is relatively close to Earth at roughly 2,500 light-years away.
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The James Webb Space Telescope has imaged the Ring Nebula in vibrant green and purple, presenting one of the most well-known objects in astronomy like never before.. 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.