What TV show started in 2007 and portrays the lives of Penny, Leonard, Sheldon, Raj and Howard?

The Big Bang Theory is an American sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the series, along with Steven Molaro. All three also serve as head writers. The show premiered on CBS on September 24, 2007. In March 2014, the show was renewed for three more years through a tenth season, which premiered on September 19, 2016.

The show is primarily centered on five characters living in Pasadena, California: Leonard Hofstadter and Sheldon Cooper, both physicists at Caltech, who share an apartment; Penny, a waitress and aspiring actress who later becomes a pharmaceutical representative and who lives across the hall; and Leonard and Sheldon's similarly geeky and socially awkward friends and co-workers, aerospace engineer Howard Wolowitz and astrophysicist Raj Koothrappali.

As the show has progressed we have seen the awkward Howard Wolowitz marry his girlfriend Bernadette and go into Space then have a baby. They have also added Amy Farrah Fowler as a love interest for the extremely quirky Sheldon Cooper. Leonard and Penny marry.