What Space Does To The Human Body

by Moin Uddin Ahmed Tipu

Now that astronaut and internet sensation Chris Hadfield is back on solid ground, he has some serious work to do. His time in space has changed his body in numerous ways. Trace explains why a zero gravity environment poses some major problems.

Read More:

Chris Hadfield’s Next Mission: Intensive Rehab

“Months needed for bone and muscle density to recover from physical effects of space”

Human Physiology in Space Outline

After 143 Days in Space, Astronauts Set to Return

“Nearly five months of cramped living in zero gravity will come to an end Thursday for one American astronaut and two Russian cosmonauts aboard the International Space Station.”

Your Body in Space: Use It or Lose It

“Besides eating and sleeping, what do astronauts spend more time doing in space than anything else? It’s exercise.”

Astronaut Fitness/Physical Conditioning

“How do astronauts maintain balance while in microgravity?”

Astronaut Strength Conditioning and Rehabilitation – ASCR

“The Astronaut Strength Conditioning and Rehabilitation Specialists or ASCRS provide a unique set of services to the astronaut community at Johnson Space Center. ks, the rigorous training schedule and the stress that space flight presents to the human body.”

Intensive Rehab Next Mission For Astronaut Hadfield

“Chris Hadfield is back safely on Earth after five months on the International Space Station, but it will take several months for the Canadian astronaut’s body to return to its pre-flight condition.”


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pinkdolphi July 12, 2013 - 12:34 AM

OMFG, there is NO SUCH THING AS *NO* GRAVITY! You are never "out of the pull of gravity" b/c gravity is the 'pull' of any object with mass on another (ex. there is always the gravitational pull of a pencil on a human [on earth, in space, &anywhere!], it is just too small to feel). The biological effects you describe are human reactions to *freefall* (a zero G environment – in contrast to something like fighter jets where people can be subject to 5G's). Please become a better science educator.

Ryan Howe July 26, 2013 - 8:05 AM

No sex no space for me

gay tony August 1, 2013 - 3:23 AM

1:43 a black man on spaaace?

Commanderxcole August 1, 2013 - 11:42 AM

I'm really hoping he was just playing stupid

Ghost Lightr August 11, 2013 - 1:49 AM

this is why I don't want to go to space…

Hazem August 23, 2013 - 7:00 AM

I Think he wasn't being serious..

hsoj Clifton August 24, 2013 - 11:38 AM


Boris August 31, 2013 - 12:08 PM

That….Would be painful.

Richard Gauthier September 15, 2013 - 8:48 PM

I don't know about all the other problems but for bone density, why not copy cats and use sound?

LeslieTan September 24, 2013 - 5:57 AM

does fapping help?

Dengekiii September 24, 2013 - 9:10 PM


CodyBaldauf October 4, 2013 - 6:00 AM

There's no Lil Wayne in space. Sounds like my kind of place.

Jean G October 4, 2013 - 7:32 AM

He might be a Walrus.

Andrei Reis October 4, 2013 - 1:14 PM

You keep saying "lack of gravity in space" which is misleading. The astronauts are falling, the gravity up at ISS height is pretty much the same as it is at surface level.

sztellanora October 4, 2013 - 7:44 PM

Why don`t we use teleoperated robots in space, at instead of spacewalks?
Or, we could genetically create people (let`s say little grey people :P) who are adapted to space! :P

Zoe Bazilchuk October 5, 2013 - 4:23 PM

In all fairness, astronauts on the ISS aren't free from gravity, they just experience weightlessness due to free fall because they're in satellite motion around the earth. Just sayin'.

Allen Natian October 19, 2013 - 2:06 PM


KvetYs October 22, 2013 - 8:39 AM

they are working on it… that why.

He nEeD sOmE MiLk February 11, 2014 - 8:19 AM

no wonder they say aliens are so skinny ._.

Roseanna Hagler March 8, 2014 - 11:29 PM


Jame Bond April 9, 2014 - 5:35 PM

This business of subjecting astronauts to the dangerous effects of zero gravity has got to stop. We have been doing this ever since the beginning of the space age about fifty years ago.  It is time we face up to the fact that the effect of zero gravity cannot be mitigated.  It is incredible that in that 50 year, we have invested almost nothing into researching or experimenting (with real space mission) with artificial gravity by spinning the spacecraft.  In my view this is the best and only way get rid of all the negative effects of zero gravity.  Not only that, designing a space life support system for one G environment would be much simpler.  It is so ridiculous and even unethical to continue this nonsense.  Think about it, we frickout when the medical community missed treated animal, yet we subject astronauts to this insane treatment?
I am so tired when I hear or read propaganda about how difficult or dangerous it is to go to Mars because of the zero G effects or the radiation.  Get over it and spin the dam spacecraft!  Oh and the radiation danger, that’s another propaganda.  But I wouldn’t go into that.
Also some nay sayer would wind about technical difficulty of designing a spinning spacecraft due to problem with communication, course change, docking and so on.  Well these problems are not easy but they are not show stopper either. There are ways to deal with them and they are much easier compare with mitigating the negative effect of zero G.
For God sake, the ISS is becoming a lab for human experimentation and the astronauts are nothing but lab rats.  What a degrading way to treat our astronauts.

Annalissa Pasap November 5, 2014 - 11:03 PM


TheBlackSpookie November 21, 2014 - 9:15 AM

I think it would be awesome. Have u lived that then danger is nothing. Not for me anyway. I love space and want to be astronaut in the future. It's one of my dreamjobs! And just look at the Earth would be amacing. Just thinking about the feeling. =^_^=

Purinmeido January 30, 2015 - 4:10 AM

I have Postural Orthostatic Tachycardia Syndrome and my body can't even deal with earth gravity.

Über Bacon September 30, 2015 - 9:02 AM

I'm so tempted to click sex in space right now xD

sleetskate October 6, 2015 - 10:53 AM

im not going to space now

random mayhem September 9, 2016 - 9:59 AM

What happens when you launch a fist full of knuckle children in space?
You shoot it into a rag? Then it would evaporate, and the climate control system would re condense it, filter it, and then before you know it.. The whole crew is drinking your spunk…

matthewakian2 November 10, 2016 - 4:52 AM

Would being in zero gravity effect the development of a toddler?

Yosra E. December 27, 2016 - 6:03 AM


Diana Riverjackson December 13, 2017 - 9:26 PM

Dude, you talk with the speed of light.
Chill down a little, it´s so fucking stressful to listen you speaking

DOLA TANKI ONLINE April 27, 2018 - 7:15 PM

Now i am not going to space 😕

HVYContent September 19, 2018 - 12:10 AM

Hey I was looking for a to-the-point explanation. Good Job kid

Jacob Degitz April 12, 2019 - 8:43 AM

Who else is here from VTPP 435??

Daniel Murray June 12, 2020 - 11:24 PM

"No alcohol in space"…looks over to the Russian module…uh ah.

A Blue Spherical Asylum October 27, 2021 - 4:47 AM

They drink artificially recycled pee and breath artificially recycled farts?