Galileo Galilei 1564 1.) He invented the telescope 2.) He used the telescope to report observations of the mountains on the moon and the moons of Jupiter and the phases of Venus and the rings of Saturn. 3.) He used a telescope to study the milky way and discovered that it has a huge number of stars. (jan 3, 1564 – jun 7, 1571)
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Date:
jan 3, 1564
jun 7, 1571
~ 7 years and 5 months