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25/08/1609 Galileo Galilei demonstrates his first telescope


The Day Galileo Changed The Universe


Telescopes: Crash Course Astronomy #6


Galileo - Mini Biography

Galileo demonstrated one of his early telescopes, with a magnification of about 8 or 9, to Venetian lawmakers. His telescopes were also a profitable sideline for Galileo, who sold them to merchants who found them useful both at sea and as items of trade.
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