if there is oxygen in space, do astronaut need to wear space suit? if yes, why? if no why??

Answer 1

Yes, there is oxygen in space. For instance, if you look at asteroids, they have water, which is a combination of oxygen and hydrogen.
Astronauts do need to wear space suits, for several reasons, not the least of which is the lack of concentration of oxygen. At sea level, oxygen is approximately 21% of the available gas. This concentration, along with the atmoshperic pressure allows your hemoglobin to hold the oxygen for transportation to the periphery, including your brain. Indeed, at a lower atmospheric pressure, or even at a less efficient blood transport system, your body can function well up until the oxygen saturation is about 88%, then additional oxygen is required. For instance, if you see someone carrying around an O2 tank, the system is not working as well as it should.
So, in space, there is oxygen, but not in sufficient concentration for human use. Therefore, for this reason and several others, space suits are required.

Answer 2

The FAA regulations require pilots to use supplemental oxygen in an unpressurized airplane at 10,000 feet or above. At that altitude there is not enough oxygen to sustain brain function well in most people.

As the altitude increases, more complete oxygen supplementation is essential, and above about 40,000 feet, an environment suit is required that completely encloses the body and provides artificial pressurization.

So clearly as you get further into open space, the need for pressurization become greater, and the suit becomes more sophisticated.

The space suit provides a breathable atmosphere and physiological pressurization without which the astronaut would die in a matter of seconds.

Answer 3

Space suits serve a number of functions. In addition to providing oxygen, they provide earth-like pressure against the body in environments where the air pressure is very low (or zero).

If they're in an environment where there's plenty of oxygen and plenty of air pressure, they probably would not need a space suit. That's the case inside the International Space Station, which is why you often see pictures of the astronauts without their space suits up there

On a planet like Mars, there is no oxygen and the air pressure is very low, so they would need to wear their space suits there--at least while they're outside.
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If we were to find a planet where there is enough oxygen to breathe and sufficiently high pressure, we probably wouldn't need space suits. We might need other kinds of protection though (like warm clothes, or gas masks to add humidity or filter out harmful elements in the atmosphere).

Answer 4

There is no oxygen in space. It is a vacuum (there are no atoms at all).
If you did not wear a space suit, these are the things that would happen to you:

1) You would become unconscious within 15 seconds because there is no oxygen.
2) Because the atmospheric pressure is so thin, your internal blood pressure would cause your blood to boil and then freeze
3) You would face extreme temperatures: 120 degrees Celsius in the sunlight and minus 100 degrees Celsius in the shade!
4) You would be exposed to various types of radiation from the sun.

And you could be hit by small particles of dust moving at high speed or, even, space debris.

Answer 5

Yes, there is oxygen in space. However, there's no atmosphere. Whatever oxygen there is is either bound up in stars or in clouds, and neither are breathable - you won't get nearly as much as you need to keep you alive, interstellar clouds have extremely low densities - and we don't have random oxygen molecules floating around in most areas of space. Besides, it's far too cold, the pressure is too low, and the radiation is too high to not have a space suit on.

Answer 6

Its not just the need for oxygen that makes it necessary to wear a spacesuit:
- there is the intense cold (in shadow) or heat (in direct sunlight)
- no air pressure (the vacuum is space, while not perfect, is a better vacuum than anything we can produce on Earth)
- no way to communicate with each other since there is no air to carry the sound
- they need to protect from micrometeors and cosmic radiation

Answer 7

I believe your blood would boil due to low pressure in vacuum. Otherwise, astronauts can't withstand the varying degrees of extreme temperature within space.

Answer 8

there is no oxygen in space and thats the reasons why the astronauts wear the spacesuit

Answer 9

There is no air in space period. It's a giant frozen vacuum, not wearing a space suit means instant death.

Answer 10

Yes b/c even if there were a sufficient amount of oxygen to breathe...space is a vaccuum so you would be killed by the pressure...or lack thereof.