Why did Yang Liwei carry a pistol when he went into space?

China opened a manned space program in 1992, and in 1999 launched the Shenzhou I spacecraft at China's Jiuquan Satellite Launch Center, and to this day a **** launched 11 times, the first four were unmanned spacecraft. By Shenzhou V is China's first manned spacecraft, the astronaut is Yang Liwei.

October 15, 2003 at 9 o'clock God five successfully lifted off, Yang Liwei took the spacecraft into the perigee of 200 kilometers, apogee 350 kilometers around the earth orbit, circling around 14 circles *** lasted 21 hours, October 16 at 6 o'clock in Inner Mongolia, Siziwangqi main landing site for safe landing, Yang Liwei has become China's first space hero.

If China's manned spaceflight, then Yang Liwei is the first to eat crabs, bear the pressure is bound to be very big. In the process of God five takeoff from the ground at a height of 30 kilometers, the occurrence of *** vibration, according to his autobiography recalled that he thought he was going to sacrifice, very painful. When he returned to Earth, this "defect" was also corrected in the subsequent Shenzhou series, which is a very valuable experience.

When Yang Liwei was in space, he also clearly heard the sound of knocking, online users jokingly called it aliens knocking on the door. The actual reason scientists speculate that the temperature and pressure changes may be caused by the metal spaceship friction sound, first of all, in 21 hours the spaceship around the Earth 14 times that is to experience 14 day and night changes, the alternation of heat and cold will occur in the phenomenon of thermal expansion and contraction.

Atmosphere outside the airship is extremely thin, and the airship will maintain the normal atmospheric pressure inside, so that the airship inside and outside the airship is a pressure difference, which also has a certain impact on the airship.

In addition to this there are also netizens who are very concerned about the question of why astronauts who go into space carry guns. Could it be that they could be used to fight "aliens" in space?

Of course, it can not be such a reason, even if the existence of aliens is not likely to appear on Earth, although the universe is very much more stars, but the universe is very large space, which also leads to a small density of stellar distribution, the nearest star from us to be in 4.22 light years away. Furthermore a gun can hit earthly creatures, but it wouldn't necessarily work for aliens.

Actually astronauts don't carry guns into space to use them in space, but to use them after returning to Earth. Under normal circumstances the return vehicle could land in a predetermined location and ground crews could be on hand to greet the astronauts as quickly as possible.

But if something goes wrong and the return vehicle goes off course, it can fly into the wild and uninhabited, where it can be used as a weapon to prevent wild animals from attacking, to hunt for food, to signal, and most importantly, to make the astronauts feel safe.

These are not random, in the last century the Soviet cosmonauts have had such an encounter, return to Earth when the orbit deviation, landing in the jungle encountered grizzly bears. Although they survived in the end, they were lucky, which made the then Soviet Space Agency decide to give cosmonauts guns. The tradition was kept alive, and other countries began to follow suit.