[BenLurkin]

Not sure about the others but I'm pretty sure gravity is a fact.

Relativity is theory, chaos theory is well, theory. Quantum mechnics . . .is largely theory.

Evolution is very much theory.

[jlogajan]

Theory versus fact designation is an arbitrary assessment. In the extreme, everything is a theory, including your perception of reality. In the less extreme, things that are overwhelmingly convincing are considered "facts." IUt is sort of a fool's errand to argue about what is fact and what is theory.

[Junior]

The scientific term "theory" does not equal the word "theory" in common use. You would do well to learn the difference.

[Servant of the Nine]

Not sure about the others but I'm pretty sure gravity is a fact.

Which "Gravity" would that be?
Classical Newtonian Gravity (with its known errors at all extremes)?
General Theory of Relativity Gravity, (with its problems in the subatomic area)?
Quantum Gravity, (with its inaplicability to the macro world)?

So9

[Lysander]

... I'm pretty sure gravity is a fact.

Well you are wrong.

Facts are observable. "A rock drops to the earth" is a fact. Facts can be replicated and reproduced. I can drop the rock, you can drop it, anyone can and get the same observational results.

Facts are grouped into principles. "All things when dropped, fall to the earth." That is an example of a principle. It comes from the facts that we all can replicate and can be supported by experimentation.

"Gravity is the force that causes objects to be attracted to each other"-- a theory to explain the principles and facts. Theories, and principles can only be supported or disproved. They are never proven by experimentation.

[cinFLA]

There are no facts; just hypotheses and theories.