The discovery of Jupiter’s moons was arguably Galileo Galilei’s most significant discovery. On the 7th of January 1610, Galileo conducted his first observation of Jupiter through his homemade telescope. In the midst of observing, he noticed three small bodies of light that looked like stars near Jupiter. He did not pay much attention to it till the very next day when he saw the same stars on the opposite side of Jupiter. Approximately one week after his first observation, a fourth star appeared. This sparked his curiosity and he proceeded to observed these phenomenons for the next two weeks. Night after night, he sketched the changing positions of the stars. After looking at his sketches at the end of the week, he realized that the stars never strayed too far away from Jupiter. In fact, their movement seemed to occur with respect to Jupiter’s position. Thus, he concluded that the bodies of light were not stars as he first thought but moons instead. This was an extremely controversial discovery as


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