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A scientific theory is a broad explanation or group of explanations for some aspect of the natural world that is consistently supported by evidence over time . A theory is the best understanding that we have of that part of the natural world . Armed with the hypothesis , the researcher then makes observations or , better still , carries out an experiment to test the validity of the hypothesis . That test and its results are then published so that others can check the results or build on them . It is necessary that any explanation in science be testable , which means that the phenomenon must be perceivable and measurable .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.