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The most dangerous mission in the universe is the spacewalk. Spacewalks are astronauts flying out of the ISS (space station) or spaceships to space. It's dangerous to go to space, but it's dangerous to swim outside of space wearing only a space suit.

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Why are you doing this dangerous spacewalk?

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1. For repair of the ship

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To repair the exterior of the ISS, spacewalks must be made. Simple tasks can sometimes be remotely repaired using a robotic arm without swimming, but only humans can do the details. In October, a team of female astronauts who made spacewalks had to replace a failed power unit.

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1. for testing

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Sometimes accidents occur during spacewalks. Space suits and helmets do not work. In 2013, an accident that caused water to fill up the helmet during spacewalks occurred. Leakage caused by the entry of foreign matter into the cooling water for space control.

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Because of this risk, spacesuit testing is very important. There are steps to build and simulate a space-like environment on the ground, but real testing is a must. In order to avoid danger, the test is to go out of the spaceship and return with the legs fixed to the robotic arm.

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1. Willingly

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Just because the ISS is big doesn't mean it's wide. The space allowed for astronauts is really narrow. Except for laboratories and control rooms, there's no place for astronauts to play. Boringly, the scenery outside the window is always the same. The window of the ISS faces the earth. Starry night sky, you have to get out of the spaceship to see the universe. As a result, astronauts are bored and want to spacewalk.

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An astronaut on National Documentary, a US documentary channel, said, "The view of the universe is so beautiful that everyone wants to do a space walk.

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