What is the maximum stay in space by a human being?
396917
The current International Space Station commander, Sergei Krikalev, has set a new record for the most cumulative time in space - logging a total of 748 days in orbit on Tuesday. His repeated exposure to the physical and psychological stresses of long-duration spaceflight ranks him among the most resilient space-farers in history.\n\nhttp://www.newscientist.com/article.ns?id=dn7852
471492
First, due to the extremely low pressure- 0 pascals - all of the liquids in your body have their boling/freezing points lowered to the same temperature; all of your exposed fluids will boil: tears on eyes, saliva, urine (depending on the person's ability to keep his or her cool). Then, the capillaries around and on your eyeballs and other mucous membranes would rupture, spraying boiling blood into space. After about 20 seconds the normal person would be unconcious, though NASA trains its astronauts to last a full minute. After about 3 minutes you would succumb to suffocation, and you body would drift to space, nearly perfectly preserved, until:\n-It finally reentered Earth's atmosphere (assuming you were in Earth's orbit), where it would vaporize; \n-It hit another space object, such as an asteroid; \n-It is pulled in by another planet. \nIt all really depends on your location.\n\nP.S. contrary to popular belief, you would NOT explode. Your body structure and skin tautness will prevent that; however, you will probably reach a very unsightly level of bloating.
980237
Since its a manned flight, the space craft being heavier, it would take at least eight months or more. However, like correctly pointed out by Christoph... N, it would be a very painful ride for the space passenger. The radiations and the athropy of the muscles & bones would cause a lot of discomfort.
722664
http://www.weboflife.ksc.nasa.gov/exerciseandaging/chapter4.html
94811
Stay right here on earth.
720326
Assuming the population of the earth is 6 billion, and the average person weighs 70kg, that equates to 420 million tonnes (if I've done my maths correctly). If everyone stood on one side and jumped simultaneously, then nothing will happen as no weight would be lost from the earth.\n\nIf everyone had such springy powerful feet that they were able to jump to escape velocity (25000 mph) which means they won't come back down again, then that would cause a displacement in weight which would affect the earth.
900746
From Wikipedia - \n \nStrongest g-forces survived by humans\n\nVoluntarily: Colonel John Stapp in 1954 sustained 46.2 g in a rocket sled, while conducting research on the effects of human deceleration. See Martin Voshell (2004), 'High Acceleration and the Human Body'.\n\nInvoluntarily: Formula One race car driver David Purley survived an estimated 179.8 g in 1977 when he decelerated from 172 km·h−1 (107 mph) to 0 in a distance of 66 cm (26 inches) after his throttle got stuck wide open and he hit a wall
100655
They will lose calcium, and atrophy.  That's why the astronauts must do such vigorous exercises; they are not working their skeletons just walking around, the way we do here under 1 g of gravity pull.
299767
YES. The atmosphere is so thin you can't breathe. When the first astronaut, Alan Shepard, rode Freedom 7 in suborbital flight we sure thought we were going into space. All the hazards of deep space were experienced on that flight.
613382
The cost to go into space is in the millions because that's what it costs to send someone into space.  It's not a big conspiracy or anything, it just costs a lot of money to build a space shuttle, fuel it, get it into space, and keep people alive for a couple days.  Government and private grants cover research missions, but the government isn't going to shell out a couple million dollars for a tourism trip.\n\nThe physical requirements are not unreasonable either.  The lack of gravity puts a huge strain on the human body.  When astronaughts come back, they have decreased muscle tone and heart strenght.  While in space, they have to work out regularly, but still, on Earth your muscles are constantly working against gravity, and when you come back, your muscles aren't ready for it.  If you aren't in exceptional physcial health, the loss of muscle tone could be extremely dangerous, and potentially even fatal.\n\nThe psycological qualifications are also not without reason.  Being in the confined space of a space shuttle with a small number of people for several days puts a huge strain on the human psyche.\n\nThat said, if I had the chance to go into space, I'd do it in a second, no doubt about it.
835630
There are no real inertial speeds in space like there are on earth! Humans can travel at any speed relative to the solar systems planets! Whether you are travelling at 500kph or 500.000kph! you would not notice the difference in space! But you would on the earth! So deep space travel is possible, for humans, but to sustain them with food and water! is another thing! A power source! is another problem, Plus! They have to stop when they get to where they are going. So the energy they have built up in speed has to be 'Bled off' as they approach their target! Another problem man has not yet worked out, is space debris! you hit something at 500.000kph! even the size of a marble! and it will go straight through you! the spacecraft! and anyone standing behind you when it hits!!! And that is assuming that the marble is just hanging in space! It could be doing a couple of million kph, it's self!!!! So space is much more formidable than you think!
946723
To escape the Earth, you have to go over 7 miles per second.  That's the escape velocity you need to escape the gravitational pull of the Earth.  The gravitational pull of a black hole (inside the event horizon) exceeds the escape velocity of light.  In other words, light would have to move faster than 186,000 miles per second in order to escape.  Since it can't, light can't escape the gravitational pull.  No sucking required.
262383
It requires enough thrust to escape Earth's Gravity. \n\nIt is said that a spacecraft uses more than 70% of the fuel on board in the first 20 minutes of the mission just to be able to "enter space", i.e. escape Earth's powerful gravitational pull.
1150073
That would sort of depend on what you land on, now wouldn't it? If you have a parachute you could jump from the top of the Petronas Towers in Malaysia and survive. I think the farthest a human has fallen accidentally and lived is under fifty feet, unless they just happened to fall into something soft like a snow drift.
524184
The effect of weightlessness is due to the fact that the astronaut is falling towards the Earth at the same rate the spacecraft is falling.  I use the term "falling" because the spacecraft, and astronaut are both being accelerated towards the earth.  The reason they remain in orbit is because they have momentum perpendicular to the Earth.  So, like a weight tied to a rope being swung in a circle, the weight is constantly being pulled towards the center of the circle, but never actually moves to the center.  Likewise, the astronaut is pulled towards the Earth, but does not fall into the earth.
393785
Mir isn't in orbit anymore, it was decommissioned and burned up in the atmosphere in March, 2001.\n\nAn astronaut, whether in Mir or in the new International Space Station (ISS) receives about 1 millisievert/day (mSv/day) or 0.365 Sv/yr.  Normal overall radiation dose for someone on earth is about 3.5 mSV/year.  4 Sv kills most people, 2 starts giving you serious health problems.  Note that different parts of your body are affected differently, so a safe dosage for your skin may not be safe for your sex organs.  Also, any high exposure increases your long-term risk of cancer, so you may be fine after a 2 Sv exposure in one day but die from cancer 5 years later.\n\nNote that radiation in space is somewhat different than radiation on earth.  It's all "radiation", but on Earth, heavy particles are typically stopped by the atmosphere.  On a space station, much of the radiation comes from "spalling", where a heavy particle or cosmic ray hits the aluminum spacecraft body and causes a release of secondary particles.  Much of the space station radiation is from these secondary particles.  Any aluminum-body station (and that's all of them) has this same problem, so ISS is just as bad as Mir.  \n\nAttempts have been made to provide additional shielding using hydrogen-containing materials such as polyethylene. In the ISS, these attempts haven't been successful.
455945
a person should not change the fuel moderator ratio, if anything the person would feel warm because their body would help dissipate the heat from the core, so there should be no effect. \nlaunching the core in to space shouldnt affect its power output, being that there is not air in space to cool it or contain it it may just overheat and melt-down, or become an uncontrolled reaction and explode like any other nuclear weapon. but i am not too sure