# Does gravity change the size of life.

• August 14th, 2006, 08:28 PM
dyslexic-autistic
Does gravity change the size of life.
If the moon was part of the earth, would the gravity be greater?

If the gravity of earth was greater, would life have to be stronger and larger to compensate for gravity?

Could this be the reason why Dinosaurs were so large?

Could the moon have come from the ice age?

Could the moon be the reason why the ice age ended?

Could the reason why living things today aren’t as big as Dinosaurs, be because the gravity is less without the mass of the moon on earth?

Would a child born on Mars with a lesser gravity, be as large as a child born on earth with earth’s gravity.

BGF
• August 14th, 2006, 10:39 PM
AlexP
Re: Does gravity change the size of life.
Quote:

Originally Posted by dyslexic-autistic
If the gravity of earth was greater, would life have to be stronger and larger to compensate for gravity?

I wonder if life would actually be smaller, because the formula for weight is w=mg (weight=mass x acceleration due to gravity). More weight pulls you down harder, so in order for a life form to not be affected by gravity too much, it could have less mass, because then its weight is less and it doesn't have to fight against gravity as much.
• August 15th, 2006, 01:30 AM
Zelos
yes. the bigger the planet the smaller the ife, becuase less and less distance in fall become lethal.
when nits ehavy enough life wont go up on land
• August 15th, 2006, 01:55 AM
J. Arthur
This was the topic Saturday night on Coast to Coast AM.

Recap
The Growing Earth

Art chatted with comic book legend Neal Adams about his research on a new model for the Universe and his theory that the Earth is growing. According to Adams, our planet was once only a quarter of its current size, with continents covering most of the world. If one reduces the ocean areas, he explained, the continents fit together perfectly on that smaller globe.

A smaller Earth would also have a corresponding reduction in gravity, Adams proposed. The effect of lower gravity on a smaller planet is what Adams thinks caused the dinosaurs to grow so large. Reduced gravity would not only affect the physical structure of dinosaurs but their movement as well. Dinosaurs had long, down-facing legs and moved more like mammals than contemporary reptiles, Adams noted. This allowed dinosaurs to achieve a speed that would not have been possible under present Earth gravity, he said.

Adams also talked about the physics behind an expanding Earth, citing Carl David Anderson's cosmic ray experiments in which a positron was "created out of nothing." He believes this kind of research shows that matter is in continuous creation in the universe, and helps explain how our planet keeps growing.

What do you think of his theory?

http://www.coasttocoastam.com/shows/2006/08/12.html
• August 15th, 2006, 03:24 AM
dyslexic-autistic
Is mars gravity not great enough to hold oxygen (air) in its atmosphere?

Is jupiters gravity great enough to hold gases lighter than air in its atmosphere?

Could life on earth become smaller as the earth grows until its gravity compresses oxygen into it's surface?

Quote

" The Earth that Tarascosaurus lived on was less than half the size of the Earth today. The weight of the Tarascosaurus was one quarter of what it would seem to be, and so he ran 50 miles per hour and his head didn't snap off when he swung it around.

From the front line,

If the earth was half the size if is today would it's gravity be strong enough to hold oxygen?

I use text to speech.
• August 15th, 2006, 03:42 AM
Zelos
Quote:

Is mars gravity not great enough to hold oxygen (air) in its atmosphere?
make some easy calculations and you´ll see

Quote:

Is jupiters gravity great enough to hold gases lighter than air in its atmosphere?
-Moderator edit: No personal attacks, keep it friendly- (Pendragon)

jupiter is still there so obviusly it can keep it becuase its mostly hydrogen

Quote:

Could life on earth become smaller as the earth grows until its gravity compresses oxygen into it's surface?
you mean turning oxygen to liquid? oh no, that would be so high gravity nothing could live there

Quote:

If the earth was half the size if is today would it's gravity be strong enough to hold oxygen?
easy calculations again
E=mv²
E=kt
E=GM/R

just threw those around and see what you get as result
• August 15th, 2006, 08:30 AM
Zwolver
Quote:

Originally Posted by Zelos
Concratulation you just won the "most stupid question ever asked" contest. How do you feel?

WTF DO YOU THINK? jupiter is still there so obviusly it can keep it becuase its mostly hydrogen

there are no stupid questions, just stupid answers.. don't discourage anyone to ask questions the normal way.

Quote:

Originally Posted by Zelos
easy calculations again
E=mv²
E=kt
E=GM/R

just threw those around and see what you get as result

Sorry, you can not get any answer with that calculation. This is theoretically possible to calculate, but in practical it wouldn't work because of unknown forces. You try calculate it with all the unknown forces and i'll see you again in 100 years.
• August 15th, 2006, 09:51 AM
Pendragon
Re: Does gravity change the size of life.
Quote:

Originally Posted by dyslexic-autistic
Could the moon have come from the ice age?

No, the moon is a lot older then that, possibly almost as old as the earth. Scientists do not agree on the origin of the moon, but one theory suggests that the moon was created by a huge collision between the earth and a large planet-like object. Wikipedia has a very nice article about the moon here.

Quote:

Originally Posted by dyslexic-autistic
Could the moon be the reason why the ice age ended?

I don't see a link between the moon and the ice age.

But you seem to have some interesting idea's, so I hope we can help you develop them :wink:
• August 15th, 2006, 11:47 AM
Zelos
sorry for the persinal attack, was in a bad mood, but i say there is stupid questions. then the answer is obviusly even mroe stupid

it isnt perfect, but it assumes there is a magnetic field possible to keep away solar wind, and then there is less unknown forces that is relevant to this
• August 16th, 2006, 12:31 AM
Secret_Agent_Man
I remember seeing somewhere that the earth may have had a higher oxygen concentration in its atmosphere, and since the air was more dense the dinosaurs wouldn't have weighed as much meaning they could be bigger. Just a thought... :D
• August 16th, 2006, 01:31 AM
Zelos
SEM, you are talking about insects, higher lifeforms (reptiles and above) can take any size becuase our lungs are so freaking effective in getting oxygen
• August 16th, 2006, 01:38 AM
iLOVEscience
but itll be bad for human if u grow into giant like dinosaurs because we would consume most of the food and human would starve and die. 2nd being big is not good because it take much more force for your heart to pump the amount of oxygen in blood and carry waste up back into the lung, so u have greater chance to die then the normal people
• August 16th, 2006, 02:56 PM
Zwolver
1) our lungs are NOT very effective in gaining oxigen. But they don't need to work better. if they would work better we would basale our body.

2) the moon did not change the earths athmosphere much, why not? because the gravity of the moon to the athmosphere is to small if you compare it to the earth. It would simply have no effect. The tides and the form of the athmosphere (high and lower pressures) do have to do with the moon.

3) the moon could have triggered the ice age. Higher and lower pressures mean higher and lower temperatures. There could have been lunar activity at an exact point that most of the sunbeams would bend away from earth