Originally Posted by 1010011010

hannukah harry, I think the word you're looking for is "phlogiston".

And I think "Gravity is a fact." would be a statement about the observation that masses exert forces on each other. The quantification of that force (E.G. the math of Newton, Kepler, Einstein, et al.) may not be exact, but someone doing their sums wrong will not suddenly make masses repel. Even more abstraction occurs when we start asking why masses attract each other... and that's where gravitational theory finally comes into play.