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If this alternative gravity theory is correct, it would be a "major revolution," Loeb said, emphasizing it would be at the scale of Newton's law of gravitation and Einstein's law of gravity.

A universal law of gravitation that is truly universal renders the up there/down here distinction meaningless, at least physically.

Newton’s universal law of gravitation is a fine example.

Indeed the law of gravitation itself was not tested until British scientist Henry Cavendish did so in 1798, while measuring the density of the Earth.

In particular, he solved what many in the eighteenth century considered the most important open problem in astronomy: reconciling the complex motions of the Moon with Newton's universal law of gravitation.