In an conflation of comedy, science and science fiction, astronaut Mike Massimino will be joining the cast of Big Bang Theory tonight. Episode 515, The Friendship Contraction, will host Massimino, a past Atlantis and Columbia veteran. Massimino’s STS 125 Atlantis mission in May of 2009 was the final Hubble servicing mission featured in the IMAX documentary Hubble; one of the …