What did Newton understand that was such a revolution? Can someone just... explain gravity to me? Let's start with a ...

However, even the metric system needs some way to define its base measurements ... “But it would also be possible to realize them in terms of gravity. After all, a gravitational field is ...

Besides quantum theory, general relativity is one of two pillars of modern physics – our working theory of gravity and of the very large, of planets, galaxies and the universe as a whole.