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The cast of "The Big Bang Theory"

Here’s an announcement written in the stars: CBS has renewed The Big Bang Theory for an additional three years, taking it into the 2016-2017 season.

It’s the second time the US sit-com has scored a three-season renewal. And one doesn’t need to be a science nerd to understand how the power behind the comedy’s ratings plays into its life extension.

The series, currently in its seventh season, is averaging a hefty 19.8 million viewers per week in the US and a whopping 6.1 among the 18-49 demo.

“Comedy is a big part of our schedule, and The Big Bang Theory is the biggest comedy force on television,” said Nina Tassler, chairman, CBS Entertainment, in a statement. “This multi-year deal further strengthens our network’s position for future seasons and marks another chapter in the great partnership CBS enjoys with [show producer] Warner Bros Television for delivering audiences the best in comedy. We’re proud to work with and showcase the incredible talents of [executive producers] Chuck Lorre, Steve Molaro and this amazing cast every week.”

The show stars Emmy winner Jim Parsons, Johnny Galecki, Simon Helberg and Kaley Cuoco. The announcement puts the comedy as CBS’ first scripted pickup for next season.