Galileo's Discoveries

Recreation of Telescope

In the autumn of 1509 he began observing the heavens with his instrument. In december he drew a chart of the phases of the moon and discovered the surface to rough and bumpy. In January 1610 he discovered four of Jupiter's moons.

The discoveries were amazing and he produced a book in which he described them. He dedicated his book to Cosimo II de Medici, a person he had tutored in maths for many summers. He named the moons after the Medici family: the Medican Stars.

As a result of his discoveries, he became strong in his belief of Copernican theology. Something the Catholic Church didn't like.