Early in the 17th century, two astronomers competed to describe the nature of our solar system.
Galileo built a telescope and found new planets and moons. Francesco Sizi ridiculed Galileo saying there must be only seven planets. After all, there are seven windows in the head—two nostrils, two ears, two eyes, and a mouth. There are seven known metals. There are seven days in a week named after seven known planets. If we increase the number of planets, he said, the whole system falls apart. Finally, Sizi claimed that because Galileo’s discoveries were invisible to the eye, they must have no influence on the Earth and do not exist.Read More