NGC 7635: The Bubble Nebula . ... Credit Copyright: Larry Van Vleet Explanation: It's the bubble versus the cloud. NGC 7635, the Bubble Nebula , is being pushed out by the stellar wind of massive central star BD+602522 . Next door, though, lives a giant molecular cloud , visible to the right. ... The cloud is able to contain the expansion of the bubble gas, but gets blasted by the hot radiation from the bubble 's central star. ... NASA Web Site Statements, Warnings, and Disclaimers . ...