High Quality Content by WIKIPEDIA articles! STS-125, or HST-SM4 (Hubble Space Telescope Servicing Mission 4), was the fifth and final space shuttle servicing mission to the Hubble Space Telescope (HST). Launch occurred on 11 May 2009 at 2:01 pm EDT. Landing occurred on 24 May at 11:39 am EDT, with the mission lasting a total of just under 13 days.