Schlezholt's Theory of Multiple Big Bangs was a theory that related to big bangs.
In the 2370s, this theory was debated by Federation cosmologists trying to disprove it, including Mortimer Harren. However, an assumption that Schlezholt's Theory hung on, known as Wang's Second Postulate, had to be ignored in order to do so, which proved very difficult. In speaking about the subject with Harren in 2376, USS Voyager Captain Janeway described Wang's Second Postulate as having "more lives than a cat". (VOY: "Good Shepherd")