The universe as a flea

Is it still the case that nobody knows what gravity, g, IS?

One useful technique for dealing with such puzzles is to turn the problem round, look at it the other way

So - what if gravity is a pushing, rather than a pulling power? If Newtons apple was repelled by the tree, not attracted by the earth

I used to try pondering this. Obviously I am not a physicist or a cosmologist. The only answer I could come up with is that not just our earth but our universe must be spinning

Inside another universe

And so on, like fleas, ad infinitum

Great fleas have little fleas upon their backs to bite 'em,
And little fleas have lesser fleas, and so ad infinitum.
And the great fleas themselves, in turn, have greater fleas to go on;
While these again have greater still, and greater still, and so on.

Augustus de Morgan: A Budget of Paradoxes

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