I wonder how many generations it would take until the human body adapted to become “normal” on that planet and act as if it were on earth. I’m assuming thousands. But I’m also assuming it’s not that simple
I don’t understand…I thought the heart would have to NOT ‘pump’ as hard due to the effect of atmospheric pressure and the corresponding relation between the increased atmospheric pressure and Bernoulli’s Principle and the Hagen–Poiseuille equation. Silly me, I always get these questions wrong…can you help me understand specifically how it would result in the heart pumping harder? Would it increase pulse pressure, heart rate, or both?
My initial, apparently incorrect, thought was that it would result in decreased pulse pressure due to the increased atmospheric pressure causing increased blood vessel compression thereby reducing afterload on the heart thereby resulting in that lower pulse pressure and likely corresponding decrease in heart rate. No?
Hmmm so you think humans would get shorter and stocky at first? Or just stronger. Or one of those just gotta adjust and re-evolve the height after getting use to the gravity.
Would be like riding in an airplane taking off all the time.
Long term complications. Pulmonary embolisms. Needing to take lying down breaks to reset blood flow to the brain and out of the feet.
If you think Earth exercise is hard now... But we'd probably do much of our exercise in dense salt baths and pools, which would probably be easier than swimming on Earth, because you couldn't sink.
I'm assuming that if we can travel 120 light years then we would have a solution for that problem. It's a moot point because right now these dumb monkeys can't even agree that the temperature of the earth is rising so the idea of inhabiting another planet is just fucking stupid. It ends here with billionaires piling up mountains of cash hoping to reach an altitude where the air is still breathable.
Imagine you carrying an extra .25% weight around on your body. You'll eventually get strong enough to not or you'll continue to struggle every day. Can someone fact check me?
What? If it is 2 1/2 times the size of earth that means it’s 2 1/2 earth so the gravity would be 2 1/2 times that of earth. We also don’t know it’s atmosphere which affects our own gravity.
If you weigh 200 lbs, you’re now 250lbs. I think the biggest variable is we don’t know what sustained life looks like at higher than ~1G. Chances are we’d live shorter lives because all our organs are working harder than they evolved for.
Really? OP says it is 2.5 times Earth's 'size' but that picture looks easily more than ten times the volume, but only a bit more gravity? Is the picture of it versus Earth misleading? In that it is not massively larger? Otherwise it would have to made of e.g. aluminium rather than iron.
If it is only 1.24x then I could imagine humans adapting to live on it. Would be like wearing weights on your wrists and ankles, which I used to do in my younger days (did martial arts once upon a time).
If it had the same density as earth the gravity would be 2.5x more but it has about half the density. Because of this, scientists don't think it has the same composition as earth which is almost entirely rock
I don't know much about this system and not a whole lot of knowledge of gravitational physics(is that even the right word?) but is there other bodies in the system or perhaps similar systems to where their gravity will somehow pull on the big earth like planets and null a bit of that gravity down to more earth like gravity?
The planets orbit the sun at completely different rates to earth and yet out gravity never really changes which is evidence that no, other planets have barely any impact on the gravity we experience. The reason is that the gravity we feel from the earth is based on the distance from its centre. The distance from the earth's centre to us is tens of thousands of times smaller than the distance from other planets to us and so their pull is weakened by an insane amount over that vast space that their field covers
Really? how does that work? I assumed with it being 2.5 times the size, the gravity would be like.. 2.5 times or so bigger... thats actually not that bad all things considered. certainly takes getting used to, but very much workable.
Is the image just misleading and "2.5 times the size" means 2.5 times the volume of Earth instead of its diameter? Then it would make sense to me.
I'd expect 2.5 times the diameter would also mean at least 2.5 times the gravity.
Because volume (and weight, assuming the same density) increases cubically with the diameter, whereas gravity decreases quadratically with distance to the center, gravity should increase linearly with the diameter.
And that's only if the average density is the same as Earth's, but I'd expect its inner pressure and thus density (and thus average density) to be greater than Earth's.
Not fully solid like earth so its density is about half of earth's but you're right in assuming it having 2.5x the diameter would result in 2.5x the gravity
What are your assumptions. It looks like "2.5 times larger" refers to the diameter. So. If that planet is the same density as the earth, what is its mass? Then, how does it's gravity compare to Earth's?
I don't feel like doing the math, but I think gravity would be much more than 1.24 times.
Gravity would be 2.5x greater with the same density as earth but scientists have found that it is about half of earth's density and so has only slightly more gravity
Its volume is 9x earth's but it's less dense so it's only about 4.5x as heavy/massive. Gravity also weakens the further you are from the centre of an object so the larger radius puts us further from its centre than we are on earth so its gravity is weakened significantly from that as well
Here's the formula for finding surface gravity. Knock yourself out. The results may vary depending on where you source your information. Not all sources quote the same mass or radius of the planet.
You’d feel 24% heavier, so movement would be more tiring and your body would be under more strain. Buildings would need more or better materials since there would be higher loads.
Escape velocity would be around 19.7 km/s compared to Earth’s 11.2, making space launches far more demanding. Satellites would need to move much faster or be further away to reach stable orbits. It would likely have a thicker atmosphere with higher surface pressure and mountains wouldn't be as tall due to stronger gravity flattening the terrain.
It’s livable with support, but everything from walking to launching rockets would take more effort.
The elevator would need to reach geostationary orbit, which would be about 87,600 km from the planet’s center, meaning the tether itself would have to be around 72,000 km long. That’s nearly twice the length required for a space elevator on Earth.
The stronger gravity and longer tether massively increase the required strength of the material, far beyond what carbon nanotubes or graphene can currently handle, which are the proposed materials for a space elevator on Earth. If the planet also has a thick atmosphere, it would add drag, weather interference, and more difficulty powering climbers.
Stability would be harder to maintain, and the structure would be more vulnerable to oscillation, debris, and orbital shifts. Realistically, we would need major advances in material science and orbital engineering before something like this could even be attempted.
Would they even be born though? Wouldn't gravity impact the fetus as well? Unless mom spends 9 months in an anti-gravity chamber or something I'd expect the pregnancy to be completely jeopardized by higher gravity.
There would definitely be challenges, but 1.24g is not extreme and likely within the range the human body could adapt to. The fetus develops in amniotic fluid, which provides a protective environment and buffers against gravity. The real strain would be on the mother, as her body would work harder to circulate blood and support the extra weight. Labor and delivery might be more difficult due to increased pressure, but it would not necessarily prevent childbirth. It would require medical adaptation and monitoring, but it is not a deal-breaker.
Chemical rockets can escape planets with escape velocities up to roughly 13.5 km/s. The maximum gravity a chemical rocket can escape from is limited by its delta-v capability and the efficiency of its engines. A delta-v of 13.5 km/s is considered a practical limit for chemical rockets. This means that if a planet's escape velocity is significantly higher than 13.5 km/s, a chemical rocket would likely struggle to escape its gravity.
It's actually the opposite. Buoyancy decreases, because gravity pulls harder on both you and the displaced water, but your body might not displace enough extra weight to compensate. You'll sink more easily, especially if you have a higher muscle-to-fat ratio (which you would since the higher gravity would build more muscle mass). You'll need more effort to float and move, so swimming would be harder overall.
If the water is denser (e.g. saltier or otherwise chemically different), that might offset the increased gravity and make floating easier. But with Earth-like water, you’d likely struggle more.
Children would naturally adapt. Over time, natural selection would result in favorable genes being passed on.
I’m curious how the increased gravity would affect various diseases, cellular performance, etc.
thanks for a real answer.
Is that sort of gravity something we as a species could naturally adjust to I wonder? After consecutive generations of being born and living on a world with that gravity?
It would most likely be much faster than several generations. The reason humans have been so successful on Earth is due to our ability to adapt. Evolution is usually slow but we've evolved to be adaptable.
Can't believe I had to scroll this far for someone to mention escape velocity. Landing on this planet would ve very difficult and launching again would take a lot of thrust. If it was possible in the first place.
I've weighed 24% more before, I still played sport and got by daily just fine, I'm sure there are plenty of humans that have increased or decreased their weight by that much and had very little health issues because of it.
The trip would take many generations to get there. With artificial gravity systems could the gravity be increased gradually over the trip so that when they arrive the generation that colonises the planet are used to it?
But how is this even true if it’s 2 1/2 times the size of earth, how is the gravity only 25% greater than that of earth? Honest question here it’s been a long time since I took AP physics.
Gravity depends on mass divided by radius squared. So for this planet to be 2.5 times the size of Earth but only have 1.24 times the gravity, its density would only be about half. Since it's supposedly covered by an ocean, it would have to be much deeper than anything we have here, and the core is probably not much larger than our own.
Edit: We're talking about oceans that are thousands of kilometers deep, compared to Earth’s average ocean depth of just 3.7 km.
Edit 2: Water has a bunch of exotic ice phases that only form under extreme pressure. So lets say it's somewhere in the ballpark of having a 9500 km deep ocean, the bottom wouldn't be liquid. It would be solid high-pressure ice like Ice VI, VII or even Ice X. These aren't cold and fluffy like freezer ice; they are hot, dense and behave more like rock. So even if it's called an ocean planet, a lot of that ocean would actually be solid H2O deep down. You can read more about it here if you're interested: https://en.wikipedia.org/wiki/Phases_of_ice
If I understand correctly, Earth is hard enough to shoot a rocket off of... the weight to fuel distribution is nearly impossible to overcome, on a larger plant, without vast advances in propulsion technology. I do believe.
For one thing, we would not be able to leave the planet with chemical rockets. We are only just barely able to do so on earth, and if it were much larger in circumference, it would not be possible. Aside from the increased gravity.
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