You know why anti-gravity aircraft exist? Because gravity was just a theory.

The laughs I get when I tell people that gravity is only a theory....so many gullible people in thia world

In response Ghost Ezra to his Publication

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“Servitude is always preceded by sleep.” - Montesquieu

I don't disagree, but much of science is a theory that fits phenomena well enough to make predictions.

The question is, which I've not seen here... What is the competing theory?

And what does gravity really mean other than a posited force to explain why things fall. That sounds like a reasonable proposition.