This was first really tested when Galileo got his hands on one of the first telescopes, and as he gazed into the night sky, what he found there was a planet, Jupiter, with four moons circling around it.
Ovo je prvotno stvarno ispitano kada se Galileo dokopao  jednog od prvih teleskopa, i gledajući noćno nebo na njemu našao planet, Jupiter, s četiri mjeseca koja su  kružila oko njega.