The ultimate high-altitude hike.
Astronauts Bernard A. Harris Jr., STS-63 payload commander, and C. Michael Foale, mission specialist, exit the airlock for their spacewalk on Feb. 9, 1995. spend most of their days in the relatively safe environment of the orbiting spacecraft. But occasionally, astronauts must face the deadly rapture of space for hours, with only the thin protection of their spacesuits between them and the frigid vacuum. These jaunts are known as spacewalks.
An astronaut trains for approximately 7 hours in the pool for every hour they might spend walking in space, according to. Underwater, astronauts practice connecting electrical cables, removing broken equipment and everything else they'll be doing in space, all while learning how to work within the constricting suit.
Most spacewalks are performed in pairs. One astronaut is the lead spacewalker, responsible for keeping track of the cadence, safety and completion of the entire jaunt. Once in orbit, preparation for the spacewalk starts days before the space travelers go out into the void. Astronauts prepare for their ultimate home-improvement project by checking every part of their suit and their tools, making sure they're both assembled and tethered properly.
Spacewalking definitely isn't like a walk in the park. Everything, including the astronaut, must be tethered at all times. Astronauts mostly use their hands to get around, pulling themselves where they need to go. In case of emergency, such as an astronaut losing their tether to the spaceship, the spacesuit comes with a jet pack called SAFER , which the astronaut controls with a small joystick.
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