“The Big Bang Theory” co-creator/executive producer Bill Prady, series star Simon Helberg (who plays Howard Wolowitz) and guest star/NASA Astronaut Mike Massimino sit in the replica Soyuz Capsule built for the season finale of “The Big Bang Theory” (airing Thursday, May 10, at 8/7c on CBS), currently on display at the Paley Center for Media in Beverly Hills, California, as part of Warner Bros. Television Group’s Television: Out of the Box exhibit. (Photo Credit: © Warner Bros. Entertainment Inc.)

The replica Soyuz Capsule built for the season finale of “The Big Bang Theory” (airing Thursday, May 10, at 8/7c on CBS), currently on display at the Paley Center for Media in Beverly Hills, California, as part of Warner Bros. Television Group’s Television: Out of the Box exhibit. (Photo Credit: © Warner Bros. Entertainment Inc.) 

“The Big Bang Theory” co-creator/executive producer Bill Prady, series star Simon Helberg (who plays Howard Wolowitz) and guest star/NASA Astronaut Mike Massimino during a Q&A after the world premiere screening of “The Big Bang Theory” season finale (airing Thursday, May 10, at 8/7c on CBS) at the Paley Center for Media in Beverly Hills, California, on Friday, May 4. (Photo Credit: © Warner Bros. Entertainment Inc.)

“The Big Bang Theory” — “The Countdown Reflection” – When Howard and Bernadette decide they want to be married before his NASA launch, the gang rushes to put on a wedding, on the fifth season finale of THE BIG BANG THEORY, Thursday, May 10 (8:00-8:31 PM, ET/PT) on the CBS Television Network.  NASA astronaut Mike Massimino guest stars as himself.