... A Bubble in Cygnus . ... Credit Copyright: Keith Quattrocchi , Mel Helm Explanation: Adrift in the rich star fields of the constellation Cygnus, this lovely, symmetric bubble nebula was only recently recognized and may not yet appear in astronomical catalogs. ... Like the Crescent Nebula itself, this cosmic bubble could be blown by winds from a massive Wolf-Rayet star , or it could be a spherically-shaped planetary nebula , a final phase in the life of a sun-like star. ... NGC 7293: The Helix Nebula...