How long can a person survive in the vacuum of space?

The space, beyond the atmosphere of Earth, has always fascinated humans. Now it is accessible to us, even if it is for scientists or the rich. It is difficult to meet someone who hasn’t got the desire to go up there, and float in the vast expanse of vacuum. However, the space is as oppressive as it is attractive. One can’t survive much longer there, without the help of a space suit. There are a number of things that make your life in space very short; from the absence of oxygen to the high-speed projectiles wandering up there.
Since there is no oxygen, which we need the most to survive, a person would lose consciousness in as little as 15 seconds. If he was to be brought back into the standard environment within two minutes or so, he can be saved.
The lack of atmosphere also means the lack of air pressure in the space. The pressure is what keeps our blood and other body fluids in liquid state, and in its absence they would ‘boil’. It would result in a rapid loss of energy, and the fluids would freeze before the evaporation. This can happen in a period between 30 seconds and 1 minute. Also the tissues of skin and the internal organs like heart and lungs would expand because of the boiling fluids and the expanding air. However, the tight structure of the skin would prevent itself from tearing apart. Due to the freezing of blood, the circulation will stop within a minute as well.
Notwithstanding all of the threats above, the space is crowded with various celestial particles that move at high velocity, with no apparent destination. Some are controlled by the gravitational forces and orbiting certain celestial bodies. Anyone of them can collide with you causing fatal damages to you. The space is also filled with various types of harmful radiations emitted by the Sun and other stars. These can cause very serious damages to the body.
Then there is the temperature. The temperature in space shows an extreme range of difference which can be withstood by no human. It can range from minus 100 degree Celsius to 120 degree Celsius. All of these situations taken into account, a person can survive barely a minute or two in outer space without any kind of protective gears.
Most of these conclusions, apart from that about cosmic objects and radiations, come from studies on animals, especially dogs and chimpanzees. Experiments proved that chimpanzees can survive longer in space than dogs. Also, a few human accidents have also contributed to these findings.

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