What effect would changes in gravity have on evolution?

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gbagcn2
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What effect would changes in gravity have on evolution?

Postby gbagcn2 » Sat May 01, 2010 12:31 am UTC

For example if the gravity of earth was 2 times as strong or 2 times weaker how would animals have evolved differently?

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Josephine
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Re: What effect would changes in gravity have on evolution?

Postby Josephine » Sat May 01, 2010 1:55 am UTC

higher gravity means creatures lower to the ground. think crocodiles with thicker legs. Lower gravity would see things the size of dinosaurs.
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Re: What effect would changes in gravity have on evolution?

Postby Weeks » Sat May 01, 2010 2:17 am UTC

Your face would be uglier, for example.





Nothing personal.

(Alternatively, what nbonaparte said. Though I think lower gravity would allow for lighter bones without losing resilience, which might mean more flying animals?)
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Re: What effect would changes in gravity have on evolution?

Postby Robstickle » Sat May 01, 2010 5:44 pm UTC

We'd be like the Sontarans.

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Re: What effect would changes in gravity have on evolution?

Postby Roĝer » Sat May 01, 2010 6:27 pm UTC

If gravity were too weak, the atmosphere could not be retained and there may not have been life at all, or only in the oceans.
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Re: What effect would changes in gravity have on evolution?

Postby GraphiteGirl » Mon May 03, 2010 1:34 am UTC

If gravity were just slightly weaker, and we had less atmosphere, would that affect oxygen levels on Earth? If there were less oxygen, we might have larger lungs and big barrel chests, so as to get the largest possible breaths.
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Re: What effect would changes in gravity have on evolution?

Postby Ivora » Mon May 03, 2010 3:58 am UTC

GraphiteGirl wrote:If gravity were just slightly weaker, and we had less atmosphere, would that affect oxygen levels on Earth? If there were less oxygen, we might have larger lungs and big barrel chests, so as to get the largest possible breaths.


Ooooh! Sexy big hunky man chests! :wink:

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Re: What effect would changes in gravity have on evolution?

Postby Weeks » Tue May 04, 2010 7:39 pm UTC

Ivora wrote:Ooooh! Sexy big hunky man chests! :wink:
I think they'd be pretty common in any case...not much sexier than regular people's chests right now.
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Re: What effect would changes in gravity have on evolution?

Postby SlyReaper » Wed May 05, 2010 6:43 am UTC

If gravity were weaker, we'd be ten foot tall blue cat people. Clearly.

Okay, with reduced gravity, the strain on bones and joints would be reduced so animals could evolve more towards the quick/agile end of the spectrum as opposed to the tough/bulky end. Plants would probably grow taller. Reduced gravity would also (I think) result in reduced air pressure at the surface, so we'd either get larger lungs or we would be less energetic.
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Oort
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Re: What effect would changes in gravity have on evolution?

Postby Oort » Sun May 09, 2010 7:05 am UTC

If Superman has taught us anything, it's that higher gravity would produce Kryptonians who would appear to have superstrength in Earth gravity.

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Josephine
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Re: What effect would changes in gravity have on evolution?

Postby Josephine » Sun May 09, 2010 7:46 am UTC

SlyReaper wrote:If gravity were weaker, we'd be ten foot tall blue cat people. Clearly.

Okay, with reduced gravity, the strain on bones and joints would be reduced so animals could evolve more towards the quick/agile end of the spectrum as opposed to the tough/bulky end. Plants would probably grow taller. Reduced gravity would also (I think) result in reduced air pressure at the surface, so we'd either get larger lungs or we would be less energetic.

That's why I said dinosaurs. Extra oxygen has a similar effect.
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