in 1454
Yes
Galileo did NOT discover Jupiter; just Jupiter's 4 largest moons.
Galileo was the first person to observe the four largest moons of Jupiter, now known as the Galilean moons (Io, Europa, Ganymede, and Callisto), using a telescope in 1610. The moons of Uranus were discovered by Sir William Herschel in 1787, long after Galileo's observations.
He saw 4 moons
The Galileo spacecraft collected information about Jupiter and it's moons ; see related link below .
No, Galileo has been the only probe to actually orbit Jupiter.
Galileo Galilei, when he trained his new telescope on the sky.
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Galileo Galilei discovered Jupiter in 1610.
Galileo
The big one for the Earth, of course, which everybody sees. But Galileo was the first known person to see the four "galilean" moons of Jupiter; Europa, Callisto, Ganymede and Io. There are another 60 or so moons of Jupiter, but they are all much smaller; far too small to be seen in Galileo's early telescope!
One thing Galileo was famous for was studying Jupiter and its moons.