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Their bones, heart, and muscles begin to waste away because they cannot strengthen themselves by working against Earth's gravity; if they return from over 8 months in space, their bones would instantly break. It's not a pretty picture.

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Q: What happens to astronauts in space for a long period of time?
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Why skeleton of astronauts turn red in space?

I don't think that they do. However astronauts skeleton's do tend to lose some of their calcium while in space. This is because the lack of gravity means that the skeleton is not stressed. To try and prevent this calcium loss astronauts try and exercise hard (to stress the bones) if they are in space for a long period.


What do astronauts do in outer space?

They study how long to get to planets and if there is life in outer space.


What are facts about the first space station?

Some facts are- It is used for astronauts to stay in space for a long period of time -Used for longer research -that maybe someday people could live on the moon


Can astronauts work in a space shuttle or space station for long periods of time?

we can not suvive later


How long do astronauts stay on the space station?

Astronauts stay on the ISS for 6 or more months.Generally, it is for 6 or more months.


How long do people live in space?

The astronauts will have to live in space according to the space plan, example the days in space planned by N.a.s.a.


How long can astronauts survive in space?

No one knows, but typically astronauts do not stay in space for more than 1 year. Otherwise, the zero gravity will degrade their bones and muscles


How long do astronauts stay on the International Space Station?

Astronauts stay on the ISS for 6 or more months.Generally, it is for 6 or more months.


How long do astronouts spend in space?

Astronauts spend 6 months in space with out there familys or there kids but they do get a lot of money


How long do most astronauts go into space?

it sometimes takes up to 12 months


Why do astronauts use ear thermometers?

so they don't stay out in space, out of space craft for too long otherwise they will get hypothermia and frostbite.


How long will astronauts footprints on the moons surface remain for?

They'll be there as long as the moon is. Space is a vacuum, there's nothing there to disturb them.