Still, even Galileo recognized the ground-based uses of telescopes. After building his first telescopes, Galileo demonstrated the new instrument to the Venetian Senate, including military leaders.

The first spectacles, designed to correct farsightedness ... "objective" lens—the convex lens at the far end of the telescope—Galileo ground a lens larger than he needed, for example.

Pitts, who runs the institute's planetarium and other astronomy programs, says that receiving the telescope from Florence's Galileo Museum—the first time the instrument ever left Florence—was ...

NASA When the spacecraft’s namesake, Galileo Galilei, first trained his telescope on Jupiter in 1610, he saw only four moons: Io, Europa, Ganymede, and Callisto (arranged in this artificial ...