Generally speaking, facts are independent of belief, knowledge and opinion. Facts are different from inferences, theories, values, and objects. [2] For example, "This sentence contains words." accurately describes a linguistic fact, and "the Sun is a star" describes an astronomical fact.
fact (fækt) n. 1. something that actually exists: Your fears have no basis in fact. 2. something known to exist or to have happened. 3. a truth known by actual experience or observation; something known to be true. 4. something said to be true or supposed to have happened.