Nightscapes & Deep Sky Colors
Astrophotography © Brian A. Morganti
NGC 6888 - Crescent Nebula
50% resolution view of Crescent Nebula area below
NGC 6888, also known as the Crescent Nebula, is a cosmic bubble about 25 light-years across, blown by winds from its central, bright, massive star. When this star, WR 136, became a red supergiant around 400,000 years ago, it ejected huge amounts of gas. Today, WR 136 is energizing the gas, producing a fast stellar wind which forms the so called Crescent Nebula in the Cygnus constellation. The star is shedding its outer envelope in a strong stellar wind, ejecting the equivalent of the Sun's mass every 10,000 years. The nebula's complex structures are likely the result of this strong wind interacting with material ejected in an earlier phase. Burning fuel at a prodigious rate and near the end of its stellar life this star should ultimately go out with a bang in a spectacular supernova explosion.
This emission nebula, at a distance of about 5000 light years from Earth, depicts two shock waves, one moving outward and one moving inward. Oxygen atoms produce the blue-green hue that seems to enshroud the detailed folds and filaments.
Astrophotography - Nightscapes & Deep Sky Colors