NASA celebrated an important milestone Friday: its 200th spacewalk on the International Space Station.
Friday's spacewalk might seem a bit routine compared to NASA's first ISS spacewalk in 1998 when astronauts were putting the station together. They attached the first two components of the station: a Russian module and a U.S. one.
Spacewalks have come a long way. During NASA's first-ever spacewalk in 1965, astronaut Ed White ventured out of the Gemini IV spacecraft, propelling himself with a hand-held oxygen jet-tank. The tank ran out of fuel after three minutes, and White had to pull himself back to the capsule by his tether.
Friday's spacewalk comes at a time of uncertainty for the ISS. Congress extended NASA's station operations until 2024 but hasn't decided what to do with the station beyond then. Officials suggested eventually transitioning the ISS from NASA to the private space industry.