
Astronaut Robert L. Satcher Jr. works outside the International Space Station as he participates in Space Shuttle Atlantis' first spacewalk of mission STS-129 as construction and maintenance continue on the International Space Station in this photo released by NASA .

NASA astronaut Karen Nyberg demonstrates how she washes her hair in zero gravity in this still image taken from NASA video released on July 12, 2013.

The International Space Station (ISS) photographed by Expedition 56 crew members from a Soyuz spacecraft after undocking on October 4, 2018. NASA astronauts Andrew Feustel and Ricky Arnold and Roscosmos cosmonaut Oleg Artemyev executed a fly around of the orbiting laboratory to take pictures of the station before returning home after spending 197 days in space.

Russian cosmonaut (no name given) works during a mission in open space outside the International Space Station in this handout picture released August 24, 2012.

Astronaut Mike Hopkins, Expedition 38 Flight Engineer, is shown in this handout photo provided by NASA as he participates in the second of two spacewalks which took place on December 24, 2013.