He identified the speed of sound
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Galileo Galilei identified the moons of Jupiter, sunspots, the phases of Venus, and the craters on the Moon. He also made significant contributions to the development of the telescope and the scientific method.
Galileo Galilei was an Italian scientist and astronomer.
He did not need to discover that as it was already known by the ancient Greeks.
Galileo Galilei's contemporaries included Johannes Kepler, René Descartes, and Isaac Newton. These scientists and philosophers made significant contributions to the fields of astronomy, mathematics, and philosophy during the same time period as Galileo.
Galileo discovered Saturn in 1610 through his telescope. He observed its unique shape and rings but was unable to identify them accurately at the time.
Galileo observed Saturn's rings in 1610 with his telescope. However, he initially mistook them for handles or large moons and was unable to accurately identify them as rings.