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What planet did galileo discover?

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By YourDictionary Galileo Galilei was an Italian astronomer and physicist, as well as a mathematician and a philosopher. He was a Renaissance man. He made significant contributions to the field of astronomy, such as designing improvements to the telescope and detailing extensive notes recording his observations. read more

Galileo didn't discover any planets, but he did discover the four brightest moons of Jupiter. All the planets but two were already known in Galileo's time, in fact for thousands of years before Galileo's time. read more

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Terrestrial Bodies in the Solar System
Source: spiff.rit.edu