Also a good link
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Fascinating!
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I recently watched this vid with Carl Sagan explaining a tesseract/hypercube which is a 4 dimensional object that simply couldn’t physically exist in 3 dimensions which got me to thinking that if spacetime either is or exists in the 4th dimension, then gravity (and dark matter/energy) is a 4th dimensional concept/substance and because we humans exist as 3 dimensional beings we will never be able to fully comprehend it in 3 dimensions , we can think about it, we can see and feel some of its effects but will never understand how it truly interacts with 3 dimensional matter.
On a side thought, which is the first dimension? is it length or width? or is it either depending on perspective? could a 1 dimensional object even be seen? I imagine it as an invisible line made up of nothing… so maybe gravity physically exists in the 1st dimension not the 4th and that’s why matter seems to be connected by something we can’t see 
what if you curved a 1 dimensional line would the line itself still be considered 1 dimensional… my head kinda hurts now 
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Juicee I suppose a person with a basketful of eclectic interests is fun to be around but I prefer to think of you as an uptown girl with a downtown heart.
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Loloud! TOO FUNNY!