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Thread: How Many G's On the Surface of the Sun?

  1. #1 How Many G's On the Surface of the Sun? 
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    G force is acceleration. Enough G force will kill you. Earth is 1 G, and we can handle that OK. But anything above that we can only handle for so long before we suffer or die.

    Now, assuming a world had the mass of our sun,, how much G force would that be?

    To find out all you really need is the G force of the sun.


    I have a really good guess that human's couldn't surivive on such a world, even if they managed to land safely somehow on it.

    Also, given the gravity of the surface of the sun (which would make something a 100 pounds on Earth weigh over 2000), it would be REALLY hard to escape it's pull if your on it's surface.

    That's not even mentioning the heat. It's safe to say that any HUMAN led trip to the sun or a planet of equivalent mass is a one way trip.


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    Typing gravitational constant*mass of sun/(radius of sun)^2 into Google returns: 274.434141 m / s2 or almost exactly 28 times Earth gravity.


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  4. #3  
    AI's Have More Fun Bad Robot's Avatar
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    A more interesting topic would be, what if we found a near duplicate of Earth, the only difference is it is a 2G world. I think we would survive just fine. It would be hard living for the finders, but second and third generation humans would adapt just fine, I'm sure. Once they've adapted they could find a 3G world and adept from 2G to 3G and so on.
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    Quote Originally Posted by Bad Robot View Post
    A more interesting topic would be, what if we found a near duplicate of Earth, the only difference is it is a 2G world. I think we would survive just fine. It would be hard living for the finders, but second and third generation humans would adapt just fine, I'm sure. Once they've adapted they could find a 3G world and adept from 2G to 3G and so on.
    So hello superman huh?

    Truth is, though, the superstrength wouldn't last once they come back to their homeworld (Earth).

    Since muscles atrophy when in weaker gravity environments (just like with astrounauts), so it would be fun, while the strength lasted.

    And that's presuming you have a way to get back to Earth in time where space ride itself doesn't weaken you muscles. But being able to handle more G's has advantages.

    You could handle greater accelerations in your spaceships, cutting down travel times.
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  6. #5  
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    Quote Originally Posted by Bad Robot View Post
    A more interesting topic would be, what if we found a near duplicate of Earth, the only difference is it is a 2G world. I think we would survive just fine.
    In a way. You'd initially see everyone get crippling arthritis by age 20, cardiovascular failure by age 30, varicose veins, lots of broken limbs etc. Eventually we'd evolve to better survive in the new environment, but such adaptations take tens of thousands of years. You don't get better knee cartilage just by being born in a high-G world, for example.

    However there's a definite limit to how far this can go. Ants will never be able to be the size of elephants because their design just doesn't scale like that. Thus at some point we'd lose the ability to even evolve to better suit the higher G environment.
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    Quote Originally Posted by billvon View Post
    Quote Originally Posted by Bad Robot View Post
    A more interesting topic would be, what if we found a near duplicate of Earth, the only difference is it is a 2G world. I think we would survive just fine.
    In a way. You'd initially see everyone get crippling arthritis by age 20, cardiovascular failure by age 30, varicose veins, lots of broken limbs etc. Eventually we'd evolve to better survive in the new environment, but such adaptations take tens of thousands of years. You don't get better knee cartilage just by being born in a high-G world, for example.

    However there's a definite limit to how far this can go. Ants will never be able to be the size of elephants because their design just doesn't scale like that. Thus at some point we'd lose the ability to even evolve to better suit the higher G environment.

    Bilivion's right. We humans are hard wired to be, well, quite not so super.

    Our superpower is our mind. And our machines, our glorious machines.

    But on a high gravity world? Even those get wrecked LOL.
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  8. #7  
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    Quote Originally Posted by lorbo View Post
    Quote Originally Posted by Bad Robot View Post
    A more interesting topic would be, what if we found a near duplicate of Earth, the only difference is it is a 2G world. I think we would survive just fine. It would be hard living for the finders, but second and third generation humans would adapt just fine, I'm sure. Once they've adapted they could find a 3G world and adept from 2G to 3G and so on.
    So hello superman huh?

    Truth is, though, the superstrength wouldn't last once they come back to their homeworld (Earth).

    Since muscles atrophy when in weaker gravity environments (just like with astrounauts), so it would be fun, while the strength lasted.

    And that's presuming you have a way to get back to Earth in time where space ride itself doesn't weaken you muscles. But being able to handle more G's has advantages.

    You could handle greater accelerations in your spaceships, cutting down travel times.
    I was thinking they would make the 2G world their world and they wouldn't be moving back to Earth. But if you were raised on the new 2G world not only your muscles but your bones would be thicker and stronger. Also on a 2G world the atmosphere at the surface would most likely be denser and a much higher pressure that we would have to adjust to. Maybe we wouldn't even be very human looking anymore.
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    Quote Originally Posted by billvon View Post
    Quote Originally Posted by Bad Robot View Post
    A more interesting topic would be, what if we found a near duplicate of Earth, the only difference is it is a 2G world. I think we would survive just fine.
    In a way. You'd initially see everyone get crippling arthritis by age 20, cardiovascular failure by age 30, varicose veins, lots of broken limbs etc. Eventually we'd evolve to better survive in the new environment, but such adaptations take tens of thousands of years. You don't get better knee cartilage just by being born in a high-G world, for example.

    However there's a definite limit to how far this can go. Ants will never be able to be the size of elephants because their design just doesn't scale like that. Thus at some point we'd lose the ability to even evolve to better suit the higher G environment.
    I did say that first generation would have some hard living. You have to remember even on Earth when humans were very primitive the average life span was something less than 30 years. Also, yes there would be some limit on G's that would be impossible to survive in no matter how adapted we were. Not sure what that would be not to much past 3 or 4 I'm sure.
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    Deleted for redundancy
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    Yeah. And we just keep on going until we can stand on a neutron star drinking our beer.

    Planets much smaller than Earth can and do have atmospheres denser than 1G Earth. The moon of Titan has a surface pressure of 146.7 KPa (compared to Earth's 101.3kPa).

    edit: I changed my mind on what I posted and deleted half the post, so now my post seems irrelevant and is. Sorry.
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  12. #11  
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    Quote Originally Posted by Bad Robot View Post
    I was thinking they would make the 2G world their world and they wouldn't be moving back to Earth. But if you were raised on the new 2G world not only your muscles but your bones would be thicker and stronger.
    But they would not be 2X stronger. We have a limit on how much we can adapt. And of course our joints would wear out sooner.
    Also on a 2G world the atmosphere at the surface would most likely be denser and a much higher pressure that we would have to adjust to. Maybe we wouldn't even be very human looking anymore.
    After a few dozen generations we would start to look different. Probably much shorter and fatter, with thicker ankles/legs, less flexibility and more protection (fat? skin?) against impacts. And as usual, this would not be because we would adapt during our lifetimes somehow; it would be how evolution usually works, which is that all the tall/skinny/flexible people will die before reproducing,
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  13. #12  
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    Quote Originally Posted by billvon View Post
    Quote Originally Posted by Bad Robot View Post
    I was thinking they would make the 2G world their world and they wouldn't be moving back to Earth. But if you were raised on the new 2G world not only your muscles but your bones would be thicker and stronger.
    But they would not be 2X stronger. We have a limit on how much we can adapt. And of course our joints would wear out sooner.
    Also on a 2G world the atmosphere at the surface would most likely be denser and a much higher pressure that we would have to adjust to. Maybe we wouldn't even be very human looking anymore.
    After a few dozen generations we would start to look different. Probably much shorter and fatter, with thicker ankles/legs, less flexibility and more protection (fat? skin?) against impacts. And as usual, this would not be because we would adapt during our lifetimes somehow; it would be how evolution usually works, which is that all the tall/skinny/flexible people will die before reproducing,
    So your saying the women will be ugly as sin? Ouch! That will hurt reproduction as much as anything. (Just Kidding)

    Beds would have to be closer to the ground as falling out of bed at 2G could be very bad for your health. Cities will have a much lower skyline, and considering what it takes to get off planet Earth. I would imagine it would be a great deal more difficult to achieve orbit on a 2G world.
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  14. #13  
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    [QUOTE=Bad Robot;519177] Also on a 2G world the atmosphere at the surface would most likely be denser and a much higher pressure that we would have to adjust to.

    One thing to look out for here is that with a denser atmosphere, the air would have to have a lower percentage oxygen content. At partial pressures just 50% greater than Earth normal, Oxygen toxicity starts to be a problem.
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  15. #14  
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    Quote Originally Posted by Janus View Post
    Quote Originally Posted by Bad Robot View Post
    Also on a 2G world the atmosphere at the surface would most likely be denser and a much higher pressure that we would have to adjust to.
    One thing to look out for here is that with a denser atmosphere, the air would have to have a lower percentage oxygen content. At partial pressures just 50% greater than Earth normal, Oxygen toxicity starts to be a problem.
    Well yes that could be a problem. But after thinking about it, maybe the pressure wouldn't be so high. After all Venus has less than 1G but extremely high surface pressure, so I'm not sure the number of G's is relevant to atmospheric surface pressure.
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    Quote Originally Posted by lorbo View Post
    I have a really good guess that human's couldn't surivive on such a world, even if they managed to land safely somehow on it........That's not even mentioning the heat.
    When the American's were planning the moon landings a story circulated that the Irish were planning to land on the sun.
    "You can't be serious", they were asked. "The sun is very hot. You would burn up."
    "Ah, no sir, not at all." They replied. "We plan to go at night."
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  17. #16  
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    lol John

    And on topic, I remember a kind of documentary from Hawking's idea, stating life on high G planets would get closer and closer to the ground, eventually with high enough Gs, every creature would be snake like.
    Conversely on low G planet you can expect very tall/thin creature.
    If you can't explain it simply, you don't understand it well enough.
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  18. #17  
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    Quote Originally Posted by John Galt View Post
    Quote Originally Posted by lorbo View Post
    I have a really good guess that human's couldn't surivive on such a world, even if they managed to land safely somehow on it........That's not even mentioning the heat.
    When the American's were planning the moon landings a story circulated that the Irish were planning to land on the sun.
    "You can't be serious", they were asked. "The sun is very hot. You would burn up."
    "Ah, no sir, not at all." They replied. "We plan to go at night."
    The last time I read that one it was a blond joke.
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  19. #18  
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    Quote Originally Posted by Ximlab View Post
    And on topic, I remember a kind of documentary from Hawking's idea, stating life on high G planets would get closer and closer to the ground, eventually with high enough Gs, every creature would be snake like.
    If you want to take that to its logical extreme, check out Robert Forward's book "Dragon's Egg." It postulates what life would be like on a neutron star.
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  20. #19  
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    Quote Originally Posted by billvon View Post
    If you want to take that to its logical extreme, check out Robert Forward's book "Dragon's Egg." It postulates what life would be like on a neutron star.
    All the creatures would quickly be compressed by the extreme gravity until the electromagnetic forces maintaining their shape are overcome, resulting in incredibly thin, creature-shaped bumps of matter on the surface?
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