NY As shown in his sketches, Galileo saw that the moon was no perfect sphere. Biblioteca Nazionale, Florence / Granger Collection, New York Galileo's work pleased the Medicis; he named Jupiter's ...

Galileo Galilei, with a homemade telescope, noticed three points of light near Jupiter. Initially believing they were distant stars, Galileo’s repeated observations over several nights and realized ...

In January 1610, astronomer Galileo Galilei spotted what he thought were four small stars tagging along with Jupiter. These pinpricks of light are actually Jupiter's four largest moons ...