What does this quote mean “A theory is no more like a fact than a photograph is like a person”?
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That means whoever said it doesn’t understand what “theory” means. When a scientist uses the word “theory” he doesn’t mean “wild guess” or “vague hunch”. A scientific theory is rigourously and thoroughly tested and found to be able to make reliable and accurate predictions about the world. The theory of gravity allows us to make highly accurate predictions about complex gravity-based systems like satellite orbits, solar systems, and galaxies months, years, even *centuries* ahead.
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