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Webthe story of galileo's telescopic observations illustrates how a tool for seeing and collecting evidence can dramatically change our understanding of the cosmos.

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Webhis observations of how a comet moved among the stars in 1577 proved that comets moved about freely through the realm of the planets, a discovery that shattered.

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Webso when galileo, then 45 years old, turned his telescope to the heavens in the fall of 1609, it was a small act of dissent.

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