File:Galileo telescope.jpg - Wikimedia Commons
File:Galilean telescope-CnAM 8606-IMG 6433-white.jpg - Wikimedia Commons
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Galileo Galilei - Wikipedia
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Galileo Galilei - Wikipedia
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Galileo Galilei - Wikipedia
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Galileo Galilei - Wikipedia
History of the telescope - Wikipedia
Galileo Galilei - Wikipedia
Telescope: A brief history, overview, and modern research implications
