Every theory in science is a theory. Einstein's General Relativity, which has been proven up, down and backwards, is a theory. Gravity is a theory. In science, if it's backed by evidence, it's a theory. If not, it's a hypothesis. The popular usage of the word "theory" has blurred this definition, but to scientists the original meaning is the correct one.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort