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character: Johannes Kepler

topic: Advancements in telescope design

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character: Galileo Galilei

topic: Improvements in the early telescope

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character: Isaac Newton

topic: Reflecting telescope innovations

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character: Hans Lippershey

topic: Invention of the telescope

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https://www.yourstory.education/learn?character=Hans+Lippershey&topic=Invention+of+the+telescope