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Weight and Height likelihoods for theoretical Mars Humanoid

 
Anonymous Coward
User ID: 203352
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01/24/2008 02:05 PM
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Weight and Height likelihoods for theoretical Mars Humanoid
Earth Wt Avg. 150 lbs (adult)
Earth Ht Avg. 66" (adult)

Mars equivalent based on Gravity compared to Earth
Wt = 55 lbs
Mars equivalent based on Gravity compared to Earth
Ht = 36" +/-

Mars equivalent based on Mass compared to Earth
Wt = 15 lbs
Ht = 24" +/-

Much smaller than you might first expect. Even smaller if talking about children.

So we should possibly not be looking for a human-size humanoid on Mars, but a very small specimen.
Anonymous Coward
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01/24/2008 02:13 PM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
Earth Wt Avg. 150 lbs (adult)
Earth Ht Avg. 66" (adult)

Mars equivalent based on Gravity compared to Earth
Wt = 55 lbs
Mars equivalent based on Gravity compared to Earth
Ht = 36" +/-

Mars equivalent based on Mass compared to Earth
Wt = 15 lbs
Ht = 24" +/-

Much smaller than you might first expect. Even smaller if talking about children.

So we should possibly not be looking for a human-size humanoid on Mars, but a very small specimen.
 Quoting: Anonymous Coward 203352

wtf
Anonymous Coward
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01/24/2008 02:17 PM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
A child might only be 8" tall using the Mass(E) Mass(M) ratio. Anatomically correct for a humanoid but only 8" tall.
Anonymous Coward (OP)
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01/24/2008 02:27 PM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
As far as using the gravity numbers, this would be based on action/reaction philosophy. Everything is smaller scale on Mars compared to earth, not larger.

There is less resistance, so diminished growth in reaction. Bones/muscles need not develop large because it's not necessary. Miniaturism results.
Anonymous Coward
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01/24/2008 02:33 PM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
And with diminished food supply miniaturism is more efficient.
Anonymous Coward
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01/24/2008 03:21 PM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
Interesting...
Anonymous Coward
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01/25/2008 12:51 AM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
bump
Wraithwynd

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01/25/2008 01:27 AM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
Hmmmm.

Gravity is why humans are so short, not the reason why they are so tall.

Compare whales to land animals. Whales exist as large as they are because they live in water, it supports their mass, it could be roughly considered as a low G environment. Prior to moving back to the oceans (they were at one time land animals) there were smaller, on part to large horses.

It has already been calculated that men from Earth on the Moon or on Mars would, over time, grow far taller (and weaker) than those who remain on Earth. Martians (men on Mars) would have the best chance of returning to earth for visits, they would range between 7 to 8 feet tall, be far thinner and would require far less food. Lunatics (men from the moon) would range between 8 to 10 feet tall, be terribly thin and their bones would be so brittle that they could never return to earth.

Gravity limits the size of insects - if we had less gravity insects would be taller, larger (more able to pump oxygen around their bodies, their exoskeletons could support their mass, etc.).

Other factors that do affect size of known species.

Limited resources (food chiefly, land secondly) leads to miniaturization of animals who are on islands compared to their cousins on the main land. Procreation rates. Those species that naturally have higher birth rates are smaller. Those that can breed like well rats tend to be very small and have very high numbers. This means that the amount of food available can feed the total population. Small makes sense if you are going to survive via sheer numbers.

No you should not expect to find a human-sized humanoid on Mars (due to gravity) instead you should be looking for something a couple of feet taller and much thinner - more like a stretched out human, not a shrinky-dink in proportion humanoid.

Limited water, limited food, limited living space would have a HUGE impact on the size of the individuals within the species. Availability of food spawns large species, thus we find small animals in the dessert and large animals in savanna or jungle settings (see lions, tigers and bears).

Edit addition:

Humanity has been growing in recent generations. Why? Has gravity decreased? No, because we have more food to eat. Or because we eat diets higher in calories.

Take a third generation Asian in the western world, compare to an Asian in Asia - see how often the larger of the two are the ones in the western world where high calorie foods are readily available.

Compare how men have grown around the western world due to the increase in abundance of food. Gravity has not decreased (if anything it has increased with the constant in fall of material from space)
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Thread: Sinkholes Updated 28 Dec 2010
find a sinkhole, add it to this thread, please.

"Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him." (1 John 3:15, NKJV).
Anonymous Coward
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01/25/2008 07:50 AM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
Hmmmm.

Gravity is why humans are so short, not the reason why they are so tall.

Compare whales to land animals. Whales exist as large as they are because they live in water, it supports their mass, it could be roughly considered as a low G environment. Prior to moving back to the oceans (they were at one time land animals) there were smaller, on part to large horses.

It has already been calculated that men from Earth on the Moon or on Mars would, over time, grow far taller (and weaker) than those who remain on Earth. Martians (men on Mars) would have the best chance of returning to earth for visits, they would range between 7 to 8 feet tall, be far thinner and would require far less food. Lunatics (men from the moon) would range between 8 to 10 feet tall, be terribly thin and their bones would be so brittle that they could never return to earth.

Gravity limits the size of insects - if we had less gravity insects would be taller, larger (more able to pump oxygen around their bodies, their exoskeletons could support their mass, etc.).

Other factors that do affect size of known species.

Limited resources (food chiefly, land secondly) leads to miniaturization of animals who are on islands compared to their cousins on the main land. Procreation rates. Those species that naturally have higher birth rates are smaller. Those that can breed like well rats tend to be very small and have very high numbers. This means that the amount of food available can feed the total population. Small makes sense if you are going to survive via sheer numbers.

No you should not expect to find a human-sized humanoid on Mars (due to gravity) instead you should be looking for something a couple of feet taller and much thinner - more like a stretched out human, not a shrinky-dink in proportion humanoid.

Limited water, limited food, limited living space would have a HUGE impact on the size of the individuals within the species. Availability of food spawns large species, thus we find small animals in the dessert and large animals in savanna or jungle settings (see lions, tigers and bears).

Edit addition:

Humanity has been growing in recent generations. Why? Has gravity decreased? No, because we have more food to eat. Or because we eat diets higher in calories.

Take a third generation Asian in the western world, compare to an Asian in Asia - see how often the larger of the two are the ones in the western world where high calorie foods are readily available.

Compare how men have grown around the western world due to the increase in abundance of food. Gravity has not decreased (if anything it has increased with the constant in fall of material from space)
 Quoting: Wraithwynd


Assume Mars was/is scarce for food. Assume miniaturization won out as well as low center of gravity because they were the most efficient for survival. Assume that light and stretched out was not as good as light and proportional. Assume the "human" anatomy and proportions won out, only size varied, like the ancient pygmies. All of this is plausible. In a very thin atmosphere, very low to the ground is slightly better and makes ducking for cover easier. Digging is easier with a proportional but "tight" body, like a terrier dog.
Anonymous Coward
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01/25/2008 07:58 AM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
If half of travel is done below ground, strethed out is not good, but stout and small is.
dawg
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Netherlands
01/25/2008 04:59 PM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid


Assume Mars was/is scarce for food. Assume miniaturization won out as well as low center of gravity because they were the most efficient for survival. Assume that light and stretched out was not as good as light and proportional. Assume the "human" anatomy and proportions won out, only size varied, like the ancient pygmies. All of this is plausible. In a very thin atmosphere, very low to the ground is slightly better and makes ducking for cover easier. Digging is easier with a proportional but "tight" body, like a terrier dog.



Assume everything..
nimbletoes

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07/18/2013 01:24 AM
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Re: Weight and Height likelihoods for theoretical Mars Humanoid
To start with; Surface-gravity on Mars is about 40% that of Earth--i.e. SG of Earth is about 2 1/2 times that of Mars.
Now take an average human born on Earth, being 6' tall. That man or woman is 100% of their potential height on Earth, but only 40% of their potential height on Mars, because of the lower gravity of the smaller world.

Therefore, by achieving their full potential height on Mars, the far descendants of that 6' tall human colonist would be eventually 2 1/2 times as tall, i.e. 15 feet, which is the equivalent of a 6' tall person on Earth.

People on Earth can sometimes (though rarely) grow to 7' or even 8' tall. Given that, and given also that the lighter gravity of Mars would promote faster and larger bodies, it is certainly possible that people could grow to the Martian equivalent of 7' or 8', which would be about 18' or 20' tall.

This would of course have major implications for Martian architecture...

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