Galileo Galilei pointed a telescope at Jupiter in 1610, and discovered its four largest moons, Io, Europa, Ganymede, and Callisto.
(Galileo Galilei; pointed; a telescope at Jupiter; T:in 1610) (Galileo Galilei; discovered; its four largest moons)
Galileo Galilei Galileo Galilei
pointed discovered
a telescope at Jupiter T:in 1610
its four largest moons