The work of Galileo relied on instruments and experiments to reveal to him what Nature was doing, rather than on pure logic. In this fundamental way, Galileo's work differ from his predecessors who thought about the sky.
Galileo was a natural philosopher, astronomer, and mathematician who made fundamental contributions to the sciences of motion, astronomy, and strength of materials and to the development of the scientific method. He also made revolutionary telescopic discoveries, including the four largest moons of Jupiter.
Galileo thought about the sky that Milky Way was just the view of these far distant stars from earth. Nebulae or nebulous stars were in fact actually a number of small stars clustered together.
Galileo's discoveries about the moon, Jupiter's moons, and, Venus, supported the idea that not the Sun, not the Earth was the center of the Universe, as was commonly believed at the time.
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