Evidence that the universe is expanding is best provided by the.

Light from distant stars and galaxies has a Doppler shift, indicating that the universe is expanding (moving away from a central point). Because all matter goes away from the point of origin following a "bang," the Big Bang Theory is possible.

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Amethod of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.