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.
Isso foi testado pela primeira vez quando Galileu teve às mãos um dos primeiros telescópios, e, enquanto observava o céu noturno, ele encontrou um planeta, Júpiter, com quatro luas que o circundavam.