Have you ever wondered why dinosaurs were bigger in the Jurassic era and why current animals look much smaller than their ancestors? This also applies to the trees and plants.
I believe it is because the earth's gravity has increased. possibly after the big impact of an asteroid to earth, the earth's spinning speed was changed (more or less I'm not sure) or its mass was increased. I'm not sure about this but this could be a possibility.
This makes molecules closer and body cells more compact and pressed onto each other and consequently the size and height of creatures and beings decreased. Bare in mind that atoms never change shape. In fact if the gravity or pressure increases, electrons might shift their orbits and as a result other elements from the table of elements might be created. But it is likely that the increase of gravity of the earth was not that high to cause this. If this happened the life form would be have been changed or permanently removed from the earth. The nature of atoms and molecules in the whole universe is the same. Or at least in the universe that we can observe with our eyes.
How do they know that it was hard for a giant dinosaur to walk or move? How Do they know the big dinosaurs were slow? maybe they weren't ! Do you remember how Neil Armstrong or other Apollo astronauts jumped on the surface of the moon which its gravity is 1/6 of the earth? So if a giant dinosaur was also there it could walk easily on the surface of the moon. Don't you think? So the same thing must have been happening on the surface of the earth in the Jurassic era
I believe if any creature was to be created on any less-gravitational environment it would have been bigger. At the same time I believe as long as the nature of atoms and molecules are the same in the whole universe, any creature that is being evolved on other planets (which of course have gravity) must have legs to move and fight the gravity, eyes to see, skin to sense. On the other hand if the other planets have air atmosphere, we must add sound sense to their other senses also..
But, have you ever thought if there was no gravity how did animals look like? Have you seen in sci-fi movies (like the avatar) that a drop of any liquid forms a sphere shape in space? so could we also look like that? if life form was created in a gravity-less environment, did we look like spheres? of course we needed hand(s) to hold on to something. But how big could we be? how could we evolve digestion system as long as many of our digestion organs depend on gravity? could we absorb food through our skin? How did we discharge the used and unnecessary substances from our body? etc....This would need a very big mind to imagine and figure it out, maybe as big as God's, although we could study it by doing experiments in none-gravitational environments.....But I have a feeling that by the look at our universe, possibly all life forms are being created on planets and those places that have gravity. why?...I'm not really sure, but common sense tells me gravity must be there for creation of multi-celled beings. Maybe for single cell or small beings it was possible to be created and formed inside lipid layers, but when it comes to bigger size creatures I doubt this is possible. But again, I'm just saying this by the look of our universe. Maybe if there was a big sea of water, electric positive or negative environment to create and electric field, big magnetic field, carbon, Hydrogen, Nitrogen etc. it could be possible to create forms of life, but pressure must be there also to hold things together. And this pressure comes from gravity. We still don't know how atoms were created in firs place, did they all generate from the dark matter?...but current research shows that lipid-layers form a safe spherical place for creation of life forms. And this must be universal throughout our universe
All sci-fi books say that we would have been giant if we were born in space, or our bones would have been longer and thicker. This, however, doesn't necessarily mean that we could have had stronger bones but the point is that if we move to live on the planet mars, our children will be much bigger than us. We don't have the life span to become giant like our kids, as we die by the age of 60-80, but our children have much more time to adapt themselves to less gravitational environments, especially in their childhood when their body and bones are developing.
(space Adaptation syndrome)
But anyway, maybe were were supposed to be created and shape up on gravity-full planets and then leave them for the space !?
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