[bkepley]

that is as well substantiated as any other natural law, whether the law of gravity

That's fine but sometimes laws change.

[snarks_when_bored]

Well-established laws in science rarely change; rather, they are superseded by laws which take account of a wider (or more extreme) range of phenomena. Contrast the range of applicability of Newton's inverse square law of gravity with Einstein's general relativistic theory of gravity. You can send a rocket around the moon and back using Newton's law and not be off by much; but if you want to understand what happens around a neutron star or a black hole, say, Einstein's theory is essential.

[Ninian Dryhope]

"law of gravity"

Didn't Newton come up with the law of gravity? Since we have known about gravity so long, what exactly is the nature of gravity? I understand the relationship between mass and distance and all, but why is there gravity? How does it work? I do not think the best minds have been able to reconcile gravity with the forces in a unified theory have they?