page_title: Michael S. Hopkins
section_title: Expedition 37/38
hierarchical_section_title: Michael S. Hopkins / NASA career / Expedition 37/38
caption_attribution_description: English: On Dec. 24, 2013, NASA astronaut Mike Hopkins, Expedition 38 Flight Engineer, participates in the second of two spacewalks, spread over a four-day period, which were designed to allow the crew to change out a degraded pump module on the exterior of the Earth-orbiting International Space Station. He was joined on both spacewalks by NASA astronaut Rick Mastracchio, whose image shows up in Hopkins' helmet visor. The pump module controls the flow of ammonia through cooling loops and radiators outside the space station, and, combined with water-based cooling loops inside the station, removes excess heat into the vacuum of space.
context_page_description: Michael Scott “Mike” Hopkins is a Colonel in the U.S. Air Force, and a current NASA astronaut. Hopkins was selected in June 2009 as a member of the NASA Astronaut Group 20. He made his first spaceflight as a Flight Engineer on Soyuz TMA-10M/Expedition 37/Expedition 38, from September 2013 until March 2014. He was the first member of his astronaut class to fly in space.
context_section_description: In February 2011 Hopkins was assigned to the crew of ISS Expedition 37/38, becoming the first member of his astronaut class to be given a flight assignment. He began training alongside Russian cosmonauts Oleg Kotov and Sergey Ryazansky for a long-duration flight to the Space Station.
  Hopkins, joined by Kotov and Ryazansky, launched on board the Soyuz TMA-10M spacecraft on 25 September 2013, the trio docked with the International Space Station several hours later, where they all joined the Expedition 37 crew alongside Roscosmos cosmonaut Fyodor Yurchikhin, NASA astronaut Karen Nyberg and ESA astronaut Luca Parmitano. Shortly before his arrival aboard the station, the crew had welcomed the Orbital Sciences Corporation Orb-D1 mission, the first demonstration flight of Orbital's Cygnus unmanned resupply spacecraft, flying under the Commercial Resupply Services contract.
  Following the departure of Soyuz TMA-09M, carrying Yurchikin, Nyberg and Parmitano, Hopkins and his two crewmates joined the Expedition 38 crew, with Kotov taking over as Station commander. Prior to the departure of Soyuz TMA-09M they were shortly joined with the remaining three Expedition 38 crew members: Roscosmos cosmonaut Mikhail Tyrin, NASA astronaut Rick Mastracchio and JAXA astronaut Koichi Wakata aboard Soyuz TMA-11M. This unusual "direct handover" was in order to allow the crew of Soyuz TMA-11M to bring up an Olympic torch, to be returned by the crew of Soyuz TMA-09M days later as part of the Olympic Torch Relay for the 2014 Winter Olympics in Sochi, Russia. During Expedition 38 Hopkins participated in two spacewalks alongside Mastracchio lasting five hours and 28 minutes and 7 hours and 30 minutes respectively. During the spacewalks Mastracchio and Hopkins performed maintenance and upgrades on the exterior of the station. Also during ISS-38 Hopkins was aboard the station for the berthing and release of Cygnus CRS Orb-1, the first operational flight of the Cygnus spacecraft. 
  Hopkins and his two crew mates departed the station aboard Soyuz TMA-10M on 10 March 2014, leaving Tyrin, Masstrachio and Wakata aboard the station as the initial crew of Expedition 39. The trio landed in Kazakhstan less than five hours later, ending a 166 day spaceflight.
caption: Hopkins during an EVA with Rick Mastracchio
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