Space is an immense and mysterious place, and it can be deadly. Astronomers estimate that there are at least one hundred billion galaxies in the universe, and even the closest planet, Venus, is 261 million kilometers away from Earth. This means that we have no way of fully understanding the vastness of outer space. But we do know that it can kill us, and one day it will. The temperature in space is very cold, and depending on where you are, it can take 12 to 26 hours to freeze to death.
If you're close to a star, you'll burn to a crisp. It's possible to survive in space without a space suit for about 10 to 15 seconds. But if you don't have a space suit, the worst thing you can do is hold your breath. This is because the lack of pressure in space causes the oxygen inside your lungs to expand and rupture them, leading to death. In 1965, researchers at Brooks Air Force Base in Texas conducted a study on dogs exposed to vacuum at a pressure of up to three hundred and eighty parts of the atmosphere at sea level for up to 90 seconds.
The results showed that all the dogs survived. So if you had the right help, you might be able to survive exposure to the interstellar medium, but it would not be pleasant. On December 14, 1966, Jim LeBlanc became the only human being to survive conditions similar to those in space. He was inside a vacuum chamber at the Johnson Space Center in Houston when he accidentally depressurized his space suit by breaking a hose. With a push from a mutinous lieutenant out of the lock or a fierce tear in a space suit, the average victim of a film is guaranteed to die quickly and silently. If someone were locked in a space suit without oxygen, their body would decay as long as the oxygen lasted.
But if they had access to oxygen, they could survive for an indefinite amount of time. In conclusion, it's possible for humans to survive in space without a space suit for up to 15 seconds or with help for an indefinite amount of time.
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