Question : In early 1610, who discovered with his newly invented telescope that Jupiter has four moons?
Option 1: Simon Marius
Option 2: Tycho Brahe
Option 3: Galileo Galilei
Option 4: Johannes Kepler
Correct Answer: Galileo Galilei
Solution : The correct answer is Galileo Galilei.
In early 1610, Galileo Galilei discovered that Jupiter has four moons using his newly invented telescope. These moons are now known as the Galilean moons. In 1609, Galileo constructed his first telescope, which was a simple refracting telescope. His telescope consisted of a convex objective lens and a concave eyepiece lens.
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