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Phoenicians cooking on sand discovered glass around 3500 BC, but it took about 5,000 years more for glass to be shaped into a lens for the first telescope.
The telescope was introduced to astronomy in 1609 by the great Italian scientist Galileo Galilei, who became the first man to see the craters of the moon, and who went on to discover sunspots, the four large moons of Jupiter, and the rings of Saturn.