Explanation: What caused the Crescent Nebula? Looking like an emerging space cocoon, the Crescent Nebula, visible on the right, 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.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: Crescent Nebula - NGC 6888 - Wolf-Rayet star - Tumannost' Polumesyac - zvezdy Vol'fa-Raie Publikacii so slovami: Crescent Nebula - NGC 6888 - Wolf-Rayet star - Tumannost' Polumesyac - zvezdy Vol'fa-Raie
Sm. takzhe: NGC 6888: tumannost' Polumesyac Sharpless 308: tumannost' Golova Del'fina Kol'cevaya tumannost' vokrug WR 134 Shlem Tora Lebed': Puzyr' i Polumesyac Kol'cevaya tumannost' WR 134 Sharpless 2-308: tumannost' Del'fin Vse publikacii na tu zhe temu >>