Fact, Theory, Law, Hypothesis #2

An observation that has been repeatedly confirmed, and for all practical purposes is accepted as “true.”

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A testable statement about the natural world that can be used to build more complex inferences and explanations. To be a hypothesis, a statement must contain a possible explanation.

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In science, a well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses.

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A descriptive generalization about how some aspect of the natural world behaves under stated circumstances. Was once considered an indisputable truth - but no longer

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Once a theory has been tested and confirmed it cannot be changed.

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You observe that, upon waking up each morning, your trashcan is overturned and trash is spread around the yard. You propose that raccoons are responsible. Is this fact, a law, a theory, or a hypothesis?

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The universe is becoming increasingly less dense and started at some point in time with a big bang. What is this?

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Laws tells us that it happens but doesn’t describe how or why.

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Einstein’s famous equation E=mc^2 describes the action of energy being converted to mass. What is this?

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A law is better than a theory.

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