"Challenger"
STS-133 is "Discovery"'s 39th and final mission into space, the 35th shuttle mission to the ISS, and the 133rd flight in the entire shuttle program. "Discovery" has docked with two different space stations, "Mir" and the ISS, and was the first shuttle to fly after both the 
 and "Columbia" disasters. "Discovery" made its maiden flight on STS-41-D in 1984, having since become the most experienced and oldest surviving space shuttle, and delivering payloads to orbit such as the Hubble Space Telescope and becoming the first shuttle to fly a Russian cosmonaut into space.
Space Shuttle Discovery lands for final time