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What did Galileo discover in 1610?
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In January 1610 he discovered four moons revolving around Jupiter. He also found that the telescope showed many more stars than are visible with the naked eye. These discoveries were earthshaking, and Galileo quickly produced a little book, Sidereus Nuncius ( The Sidereal Messenger ), in which he described them.
- Craters and mountains on the Moon. The Moon’s surface was not smooth and perfect as received wisdom had claimed but rough, with mountains and craters whose shadows changed with the position of the Sun.
- The phases of Venus. The planet Venus showed changing crescent phases like those of the Moon, but their geometry could only be explained if Venus was moving around the Sun rather than the Earth.
- Jupiter’s moons. The planet Jupiter was accompanied by four tiny satellites which moved around it. These are now known as the Galilean moons: Io, Ganymede, Europa and Callisto.
- The stars of the Milky Way. Galileo saw that the Milky Way was not just a band of misty light, it was made up of thousands of individual stars.
Apr 3, 2014 · (1564-1642) Who Was Galileo? Galileo was an Italian astronomer, mathematician, physicist, philosopher and professor who made pioneering observations of nature with long-lasting implications for...
The story of Galileo's telescopic observations illustrates how a tool for seeing and collecting evidence can dramatically change our understanding of the cosmos. Early telescopes were primarily used for making Earth-bound observations, such as surveying and military tactics.
Feb 24, 2009 · Galileo's discoveries about the Moon, Jupiter's moons, Venus, and sunspots supported the idea that the Sun - not the Earth - was the center of the Universe, as was commonly believed at the time. Galileo's work laid the foundation for today's modern space probes and telescopes.
Jan 9, 2020 · Jan 09, 2020. Article. Peering through his newly-improved 20-power homemade telescope at the planet Jupiter on Jan. 7, 1610, Italian astronomer Galileo Galilei noticed three other points of light near the planet, at first believing them to be distant stars.
Aug 18, 2023 · Galileo used his new telescope to study the heavens in tremendous detail, publishing the fruit of his research in Sidereus Nuncius ( The Starry Messenger) in 1610.
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