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Galileo used his telescope to show that Venus went through a complete set of phases, just like the Moon. This observation was among the most important in human history, for it provided the first conclusive observational proof that was consistent with the Copernican system but not the Ptolemaic system.
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csep10.phys.utk.edu/astr161/lect/history/galileo.html
csep10.phys.utk.edu/astr161/lect/history/galileo.html
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Galileo invented many mechanical devices other than the pump, such as the hydrostatic balance. But perhaps his most famous invention was the telescope. Galileo made his first telescope in 1609, modeled after telescopes produced in other parts of Europe that could magnify objects three times.
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galileo.rice.edu/bio/narrative_6.html
galileo.rice.edu/bio/narrative_6.html
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Galileo's lead was one of practice, not theory, and it took about six months before others could make or obtain instruments good enough to see Jupiter's moons. With the verification of the phases of Venus by others, in the first half of 1611, Galileo's lead in telescope-making had more or less evaporated.
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galileo.rice.edu/sci/instruments/telescope.html
galileo.rice.edu/sci/instruments/telescope.html
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Welcome to Galileo Telescope Makers, also known as Galileo by our many fellow astronomers (we don't just sell telescopes, we use them). Galileo is a real storehouse, populated by real people, who are obsessed with helping you explore every corner of the universe and unlock its mystery.
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www.galileotelescope.com/
www.galileotelescope.com/
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The story of Galileo's telescope is well known, as he recounted it himself in the Starry Messenger. In July 1609, Galileo was in Venice, when he heard of an invention that allowed distant objects to be seen as distinctly as if they were nearby.
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www.hps.cam.ac.uk/starry/galtele.html
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"A brief history of Galileo's telescope, its predecessors, and the "telescope race" it inspired. In a 150 or so years, telescope makers like Galileo started with a collection of eyeglass […]" ... Summary: A brief history of Galileo's telescope.
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cnx.org/content/m11932/latest/
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It is no exaggeration to say that the telescope changed everything: Galileo's discoveries literally revolutionized our perception of the universe and Earth's place in it.
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www.galileoscope.org/
www.galileoscope.org/
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You have made owning a Galileo telescope a great experience. I will always own and be an advertisement for Galileo Telescope. It is important to purchase a product for a good price, but it is the customer service after the purchase that is the most important.
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www.galileosplace.com/
www.galileosplace.com/
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This article uses animations to help explain how Galileo's refractor and Newton's reflector telescopes worked, and how they remain the two standard types of optical telescopes used today. ... The spyglass-turned-telescope had limitations, some of which Galileo was able to design around. To reduce distortions such as...
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www.pbs.org/wgbh/nova/galileo/telescope.html
www.pbs.org/wgbh/nova/galileo/telescope.html
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