Despite his workload, he continued his study of the stars and planets, gathering evidence to support a revolutionary theory ​ — that the earth was not the stationary center of the universe but, in fact, moved around the sun.
Meski sangat sibuk, ia melanjutkan penelitiannya tentang bintang dan planet, mengumpulkan bukti untuk mendukung suatu teori yang revolusioner ​ — bahwa bumi bukan pusat yang tidak bergerak dari alam semesta tetapi, sebenarnya, bergerak mengitari matahari.