Comment: It is and thank you.

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It is and thank you.

It requires us to define terms better.

Observable gravity has been proven scientifically. Beliefs about gravity impossible to observe is an extrapolation and not scientifically proven.

Belief in it as scientifically proven is faith based, not based in scientific proof.

While it may be likely and, in fact, even be true, it is not and cannot be scientifically proven at this time.

That said there are many repeatable tests and repeatable local observations that can be made and those repeatable tests yielding the same results each time do constitute scientific proof of that which was repeatedly tested.