<P> STS - 125 Atlantis (May 11--24, 2009) was the final Hubble servicing mission by the Space Shuttle . Atlantis landed in California after stormy weather prevented the shuttle from landing at NASA's home base in Florida as previously planned . During the mission Massimino became the first person to use Twitter in space, writing, "From orbit: Launch was awesome!! I am feeling great, working hard, & enjoying the magnificent views, the adventure of a lifetime has begun!" Rather than using the service directly while in orbit, Massimino composed his messages and shared them with Mission Control which then posted the messages via the Internet to Twitter . Massimino's public updates about his training for the STS - 125 mission began April 3, 2009 . </P> <P> In the PBS children's program Sid the Science Kid, Michael Massimino appeared as himself in an episode focused on scientists . </P> <P> Beginning in 2012, Massimino appeared as himself in a recurring role on the CBS TV sitcom The Big Bang Theory launching aboard a Russian Soyuz to the International Space Station . He appeared in another episode advising Howard Wolowitz not to go on a second mission to the International Space Station . </P> <P> He is a frequent guest on Neil deGrasse Tyson's podcast StarTalk, and has also appeared on the TV version . </P>

Who plays the astronaut on big bang theory
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