Astronaut Mike Fossum, Expedition 28 flight engineer and Expedition 29 Commander, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Photo Credit: (NASA/Carla Cioffi)
Astronaut Mike Fossum, Expedition 28 flight engineer and Expedition 29 Commander, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Photo Credit: (NASA/Carla Cioffi)
Astronaut Ron Garan, right, Expedition 27 & 28 flight engineer, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan is joined by astronaut Catherine Coleman who was a flight engineer on Expeditions 26 & 27. Photo Credit: (NASA/Carla Cioffi)
Astronaut Catherine Coleman, Expedition 26 and 27 flight engineer, discusses her mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Photo Credit: (NASA/Carla Cioffi)
Astronaut Ron Garan, Expedition 27 & 28 flight engineer, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Photo Credit: (NASA/Carla Cioffi)
Astronaut Mike Fossum, Expedition 28 flight engineer and Expedition 29 Commander, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Photo Credit: (NASA/Carla Cioffi)
NASA Twitter follower Sarah Smith, Twitter handle @smith5se, asks a question at a Tweetup hosted by astronaut Ron Garan at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Photo Credit: (NASA/Carla Cioffi)
NASA Twitter followers are seen at a Tweetup hosted by NASA astronaut Ron Garan at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan was a flight engineer on both the Expedition 27 and 28 missions at the International Space Station. Photo Credit: (NASA/Carla Cioffi)
Astronaut Ron Garan, far right, discusses his experiences while living on the International Space Station as part of the Expedition 27 and 28 mission during a tweetup at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan has logged more than 178 days in space and 27 hours and 3 minutes of EVA in four spacewalks. Photo Credit: (NASA/Carla Cioffi)
NASA Twitter followers are seen at a Tweetup hosted by NASA astronaut Ron Garan at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan was a flight engineer on both the Expedition 27 and 28 missions at the International Space Station. Photo Credit: (NASA/Carla Cioffi)
Astronaut Ron Garan discusses his experiences while living on the International Space Station as part of the Expedition 27 and 28 mission during a tweetup at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan has logged more than 178 days in space and 27 hours and 3 minutes of EVA in four spacewalks. Photo Credit: (NASA/Carla Cioffi)
A NASA Twitter follower tweets during astronaut Ron Garan's Tweetup at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan was a flight engineer on both the Expedition 27 and 28 missions at the International Space Station. Photo Credit: (NASA/Carla Cioffi)
Astronaut Ron Garan discusses his experiences while living on the International Space Station as part of the Expedition 27 and 28 mission during a tweetup at NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan has logged more than 178 days in space and 27 hours and 3 minutes of EVA in four spacewalks. Photo Credit: (NASA/Carla Cioffi)
Astronaut Catherine Coleman, center, Expedition 26 and 27 flight engineer, discusses her mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Coleman is seen with fellow astronauts Mike Fossum, left, and Ron Garan. Fossum was a flight engineer on Expedition 28 and Commander of Expedition 29. Garan was a flight engineer on Expeditions 27 & 28. Photo Credit: (NASA/Carla Cioffi)
Mike Fossum, second from left, Expedition 28 flight engineer and Expedition 29 Commander, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Seen with Fossum are astronauts Catherine Coleman, second from right, Expedition 26 & 27 flight engineer, and Ron Garan, Expedition 27 & 28 flight engineer. Photo Credit: (NASA/Carla Cioffi)
Astronaut Catherine Coleman, center, Expedition 26 and 27 flight engineer, discusses her mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Coleman is seen with fellow astronauts Mike Fossum, left, and Ron Garan. Fossum was a flight engineer on Expedition 28 and Commander of Expedition 29. Garan was a flight engineer on Expeditions 27 & 28. Photo Credit: (NASA/Carla Cioffi)
Astronaut Ron Garan, far right, Expedition 27 & 28 flight engineer, discusses his mission to the International Space Station during a visit to NASA Headquarters in Washington, Tuesday, Feb. 14, 2012. Garan is joined by astronauts Catherine Coleman, center, and Mike Fossum. Coleman was a flight engineer on Expeditions 26 & 27, and Fossum was a flight engineer on Expedition 28 and Expedition 29 Commander. Photo Credit: (NASA/Carla Cioffi)