Italian astronomer and mathematician who was the first to use a telescope to study the stars; demonstrated that different weights descend at the same rate; perfected the refracting telescope that enabled him to make many discoveries, discovered Jupiter's major moons in 1610 with the first astronomical telescope.(1564-1642)

A NASA space exploration satellite that was launched on October 18, 1989. Galileo was sent to Jupiter to study the planet's atmosphere , moons, and surrounding magnetosphere, for 2 years starting in December 1995. 


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