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Lack of air, radiation, extreme temperatures.
The earth is protected by the atmosphere which deflects some of the radiation that comes from the sun.
The space dirt in air could be a harm to humans in large quantities. In most cases, space dirt is not considered to be harmful.
Krypton is not considered harmful to humans in normal conditions, as it is present in trace amounts in the air we breathe. However, if krypton were to displace oxygen in an enclosed space, it could potentially pose a suffocation risk.
Harsh conditions are conditions that humans would have a hard time living in or not be able to live in.
Sure ... as long as he has oxygen, pressure, suitable temperature or insulation fromthe temperature of space, and shielding from the levels of harmful radiation in space.Provide the necessary conditions, and humans can survive anywhere. Without any ofthat, maybe 10 minutes in space, less than that in some other places.
Sure ... as long as he has oxygen, pressure, suitable temperature or insulation fromthe temperature of space, and shielding from the levels of harmful radiation in space.Provide the necessary conditions, and humans can survive anywhere. Without any ofthat, maybe 10 minutes in space, less than that in some other places.
It is filled with air, as prolonged exposure to pure oxygen is harmful to humans.
No. The environment of the Moon would require humans to live in pressurized habitats, since the surface conditions there are virtually the same as in space.
Animals require much the same conditions for life as humans. It was not known if humans could survive in space, so animals were first used because they were considered expendable.
Unlimited, as long as he has oxygen, pressure, suitable temperature or insulation fromthe temperature of space, and shielding from the levels of harmful radiation in space.You provide the necessary conditions, and humans can survive anywhere, indefinitely.Without any of that, maybe 10 minutes in space, less than that in some other placeslike Venus, Jupiter, too close to the Sun, etc.
To provide an artificial environment where humans (astronauts) can live. This allows them to survive in a dangerous space environment. Without it the vacuum, harmful cosmic rays, temperature, lack of oxygen in space will: explode a person, burn, freeze and suffocate.