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Affichage des articles dont le libellé est ASTRONOMY - NGC 6888: The Crescent Nebula. Afficher tous les articles
Affichage des articles dont le libellé est ASTRONOMY - NGC 6888: The Crescent Nebula. Afficher tous les articles

12/11/2024

ASTRONOMY - NGC 6888: The Crescent Nebula

 2024 November 12

A starfield is shown with a unusual textured nebula
in the center colored in brown with blue trimmings. Diffuse
red nebula appear around the edges. In the center is an
opaque brown object. 
Please see the explanation for more detailed information.

NGC 6888: The Crescent Nebula
Image Credit & Copyright: Team ARO

Explanation: How was the Crescent Nebula created? Looking like an emerging space cocoon, the Crescent Nebula, visible in the center of the featured image, was created by the brightest star in its center. A leading progenitor hypothesis has the Crescent Nebula beginning to form about 250,000 years ago. At that time, the massive central star had evolved to become a Wolf-Rayet star (WR 136), shedding its outer envelope in a strong stellar wind, ejecting the equivalent of our Sun's mass every 10,000 years. This wind impacted surrounding gas left over from a previous phase, compacting it into a series of complex shells, and lighting it up. The Crescent Nebula, also known as NGC 6888, lies about 4,700 light-years away in the constellation of Cygnus. Star WR 136 will probably undergo a supernova explosion sometime in the next million years.

17/06/2021

ASTRONOMY - NGC 6888: The Crescent Nebula

 2021 June 17

See Explanation.  Clicking on the picture will download
the highest resolution version available.

NGC 6888: The Crescent Nebula
Image Credit & Copyright: Joe NavaraGlenn ClouderRussell Discombe

Explanation: NGC 6888, also known as the Crescent Nebula, is a about 25 light-years across blown by winds from its central, bright, massive star. A triumvirate of astroimagers ( JoeGlennRussell) created this sharp portrait of the cosmic bubble. Their telescopic collaboration collected over 30 hours of narrow band image data isolating light from hydrogen and oxygen atoms. The oxygen atoms produce the blue-green hue that seems to enshroud the detailed folds and filaments. Visible within the nebula, NGC 6888's central star is classified as a Wolf-Rayet star (WR 136). 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. Found in the nebula rich constellation Cygnus, NGC 6888 is about 5,000 light-years away.

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