He's talking about the scientific definition of "theory".
A theory in the scientific world, is a well substantiated explanation of some aspect of the world.
In lay mans terms a "theory" is accepted as fact in the scientific community.
If he were to have said Gravity was a hypothesis, your outrage would have been well deserved.
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What do u mean the theory of gravity? Gravity has been proven on the earth and you can't doubt it it's Been proven. In what do u mean the theory of gravity
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Gravitational Theory m8. That's what it is.