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Saturday 17 March 2018

Spacewalk

On March 18, 1965 Russian cosmonaut Alexey Leonov became the first person to walk in space. Leonov went outside the Soviet spacecraft Voskhod 2 for 12 minutes, tied to the ship by a 50-foot tether.

Alexei Leonov performs the first spacewalk.

During the first space walk in human history Alexei Leonov perspired so much that the sweat was sloshing around in his suit.

While performing his space walk in human history, Alexey Leonov’s spacesuit inflated so much that he had problems re-entering the ship. Lenov had to let air out of his suit while still in the vacuum of space and got temporary stuck sideways when going back in  through the airlock. The Russians did not try another space walk until four years later.

In 1985, Leonov was a founder member of the Association of Space Explorers, open only to those who have completed an orbit of Earth in space.

Although the USSR was first to do it, the Americans had coined the term 'extra-vehicular activity' (EVA) for a space walk in the early 1960s.

Ed White was the first American to take a spacewalk, when on June 3, 1965, he flew into space as pilot of Gemini 4. White was tethered to the spacecraft during his 21 minute spacewalk, and his oxygen was supplied through a 25-foot (7.6 m) umbilical cord, which also carried communications and biomedical instrumentation. He was the first to control his motion in space with a Hand-Held Maneuvering Unit, which worked well but only carried enough propellant for 20 seconds.

Ed White performs the first American spacewalk

Michael Collins, the command module pilot for Apollo 11, was the first person to perform two spacewalks in a single mission during the 1966 Gemini 10 flight. 

On November 13, 1966, Edwin "Buzz" Aldrin became the first astronaut to successfully work in space without tiring, during the Gemini 12 flight. (Previous astronauts suffered from fatigue carrying out tasks during EVA). Aldrin worked outside the Gemini craft for 2 hours and 6 minutes, demonstrating that astronauts could work outside their transport.

Aldrin's interest in scuba diving inspired the use of underwater EVA training to simulate weightlessness, which has been used ever since to allow astronauts to practice techniques of avoiding wasted muscle energy.

Usually astronauts are connected to the spacecraft through an umbilical cable; Untethered spacewalks were only performed on three missions in 1984 using the Manned Maneuvering Unit (MMU), and on a flight test in 1994 of the Simplified Aid For EVA Rescue (SAFER), a safety device worn on tethered U.S. EVAs. Astronauts Bruce McCandless II and Robert L. Stewart performed the first untethered spacewalk during the Space Shuttle Challenger mission STS-41-B on February 7, 1984.

Untethered U.S. astronaut Bruce McCandless uses a manned maneuvering unit

In 2008, China became the third country to conduct a successful space walk.

Space shuttle STS-102 crew members Susan J. Helms and James S. Voss performed the longest ever spacewalk (8 hours 56 minutes) on March 11, 2001. The spacewalk was conducted outside the International Space Station.  During the spacewalk, the astronauts were able to accomplish a number of important tasks, including the installation of new equipment for the station's robotic arm, the deployment of a new radiator for the station's cooling system, and the testing of a new camera system for future spacewalks.

Soviet/Russian astronaut Anatoly Solovyev holds the record for most spacewalks by a single person (16) and most hours spent on spacewalks (82).

Astronauts attach pieces of Velcro into their helmets to scratch their noses during space walks.

Astronauts' fingernails can fall off during space walks, due to the material and internal pressure of their gloves.

Source Daily Express

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