Sam Reality is we have many clues to help our thinking about gravity. We
are just not clever enough to put them together. GR works for the
macro gravity realm and quantum gravity works best in the micro
realm,but it can be used in macro realm. String theory when again we
are clever enough might give us the best gravity theory I think Witten
would agree with this Bert

I think gravity is an invisible force. Einstein simply didn't like the
concept of "spooky action at a distance".

On Sep 22, 3:24 pm, Sam Wormley wrote:

Did I not just point out to you, uri, that the phenomenon we
call gravity is well explained by general relativity.

To date there has never been a prediction of general relativity
that has been contradicted by on observation. General relativity
does not require any "invisible" unseen forces.

Gravitational waves have not been detected yet.