Extraterrestrial beings have visited Earth. Scientists may not use supernatural explanations as to why or how naturally occurring events happen because reference to the supernatural is outside of the realm of science. Scientists cannot conduct controlled experiments in which they have designed the intervention of a supreme being into the test. Green plants convert sunlight into energy. Each prediction can be tested to determine if the prediction is true of false.
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Reference to supernatural events or causes are not relevant tests. The Bermuda Triangle causes ships and planes to sink and disappear. Life comes from life and cannot come from non-life. Scientific theories are subject to revision and correction, even to the point of the theory being proven wrong. Scientific theories have been modified and will continue to be modified to consistently explain observations of naturally occurring events.