Jupiter's Four Moons Galileo Galilei discovered these four moons, Io, Europa, Ganymede, and Callisto, in 1610, shortly after he built his first telescope.
(Jupiter's Four Moons Galileo Galilei; discovered; these four moons; T:in 1610; T:shortly after he built his first telescope)
Jupiter's Four Moons Galileo Galilei
discovered
these four moons T:in 1610 T:shortly after he built his first telescope