If anti-gravity existed, the book that explains it would be impossible to put down. Unfortunately, anti-gravity does not exist. Or does it? It is not a settled question, and there is a sense in which it will never be. Nonetheless, that does not matter much. How can that be? Keep reading!
There are two ingredients at play in this: theory and evidence. And their connection is more complicated than one may initially think. Let me start with theory. Gravity is responsible for stuff falling on the ground, as well as for planets moving in the sky. Scientific theories have been proposed to account for these phenomena: Newton’s theory of gravity first and Einstein’s general relativity later. Newton’s gravity is a force that acts instantaneously to pull bodies closer in virtue of their mass. In other words two massive bodies, no matter how distant, feel each other’s presence instantly and tend to get together.
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