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Big Questions: Nature of Scientific Inquiry

Hubble's Expanding Universe (#105)

Edwin Hubble is renowned for determining that there are other galaxies in the Universe beyond the Milky Way, and for observing that the Universe is expanding at a constant rate. He became famous for showing that there are different types of galaxies: spiral, elliptical and irregular. Hubble proved that the Universe was bigger than previously thought by using stars that change regularly in brightness – Cepheid variable stars. Hubble found variable stars in other galaxies much farther away than the Andromeda Galaxy which eventually led to the discovery that the universe is expanding. [19 minutes] Closed Captioning

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Series Description: It's a slow painstaking business unlocking the secrets of the universe. But occasionally an inspired individual makes sense out of confusion – and comes up with a theory or invention that changes the world and our understanding of how it works. This series, enthusiastically presented by Adam Hart David, focuses on the lives, works and struggles of scientists who have made these great intellectual leaps.

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