Galileo's telescope revealed Venus's true orbit
Galileo's improved telescope revealed Venus's phases, providing compelling evidence that planets orbit the Sun, not Earth, and revolutionizing astronomy.
In 1609, Galileo Galilei improved the telescope, magnifying objects 20 times. He soon turned it skyward, observing the phases of Venus, much like our Moon. This was a huge problem for the old Earth-centered model of the universe, which couldn't explain these changes.
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