How did CBS’ Big Bang Theory send Howard Wolowitz to space?

As seen on the popular CBS sitcom “The Big Bang Theory” (now in syndication), the fictional Wolowitz (Helberg) was shown floating on board the International Space Station (ISS), serving as a member of the station’s Expedition 31 crew, during the first four episodes of the show’s sixth season.

Of course, Wolowitz was not really on the space station. The real ISS Expedition 31 ended three months before the episodes first aired in October 2012. Rather, Helberg was on a sound stage at the Warner Brothers studio lot in Burbank, California.