Question regarding dark energy and accelerated expansion. If gravitational force were somehow diminished at large distances----ie lower gravitational constant at huge distances--might this explain the increase or accelerated expansion seen. If this were true, would it be necessary to evoke a completely separate factor--ie dark energy --to explain this. For this to be even considered , one would have to humbly admit that not all is known of gravity-----less of a leap than the same statement re dark energy----????