The Crescent Nebula was created by the brightest star in its center and began forming nearly 250,000 years ago. The central star is a Wolf-Rayet star that sheds its outer envelope and ejects the equivalent mass of our Sun every 10,000 years. It is nearly 4,700 light-years in the constellation Cygnus. The central star will likely undergo a supernova explosion in the next million years.
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