'Big Bang Theory' Renewed For Three Years

"The Big Bang Theory's" Simon Helberg, Kunal Nayyar and Jim Parsons attend a game between the Houston Rockets and the Los Angeles Lakers at Staples Center in Los Angeles on February 1, 2011 "The Big Bang Theory's" Simon Helberg, Kunal Nayyar and Jim Parsons attend a game between the Houston Rockets and the Los Angeles Lakers at Staples Center in Los Angeles on February 1, 2011

CBS says it’s renewing its hit comedy “The Big Bang Theory” for three more years.

The extraordinary three-year deal would carry TV’s most-watched sitcom through the 2016-2017 season, the series’ 10th on the air.

“The Big Bang Theory” premiered in September 2007 and has been a ratings smash for virtually its entire run. It has averaged nearly 20 million viewers each week this season.

WATCH: Jim Parsons: What’s Ahead For ‘Big Bang Theory’s’ Sheldon & Amy?

A comedy about science nerds and the people who love them, it stars three-time Emmy-winner Jim Parsons as well as Johnny Galecki and Kaley Cuoco-Sweeting.

It airs Thursday at 8 PM ET.

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