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When Sheldon learns that Penny is thinking about breaking up with Leonard, he tries to intervene. Meanwhile, in space, the other astronauts pick on Howard, on The Big Bang Theory, Thursdays at 8/7c. Pictured left to right: Mayim Bialik, Jim Parsons, Kevin Sussman, Kunal Nayyar, Johnny Galecki and Kaley Cuoco. Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.