different theories hold different explanations.
one explanation uses something called a graviton to transmit the force. This has not been seen, but there is a search.
String theory also explains the cause of gravity, which could, if I heard correctly, be tested soon.
beyond the cause, there is proof of universal graviton, in the Cavendish experiment.
sure there are oddities, such as the constantly increasing expansion of the universe with no known cause beyond "dark energy" but explanations are being searched for.
Science does not hold all explanations, merely the path to find them. But that is about scientific method and theories, which belong separate from the discussion involving the observed motions of the sun and what flat earth theory predicts, what this thread was created to discuss. Please move to an appropriate place.