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!
Jupiter's largest four moons, called the Galilean satellites because Galileo was the first person to see them, are Europa, Io, Callisto and Ganymede.
His primary discovery was the four larger moons of Jupiter, which are called the "Galilean moons" in his honor. It was absolute proof that Aristotle had been wrong about everything in the heavens going around the Earth; here were these four moons going around Jupiter, not the Earth!
Telescopes have allowed us to see further than the naked eye would ever allow. With the invention of the telescope by Hans Lipperhey, mankind has discovered new planets, constellations and threats to our planet such as comets or meteors. Telescopes have also been one of the main reasons that man has begun to explore space, we see things out there worth discovering and taking a closer look at.
Galileo was the first person to observe the moon through a telescope.Galileo correctly inferred that some of the light-colored features he saw on the moons surface were highlands, or mountains.
Galileo I am not so sure he was the first, but he is the most famous.
He saw 4 moons
Yes
Galileo discovered four large moons of Jupiter, now known as the Galilean moons. These moons are Io, Europa, Ganymede, and Callisto.
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.
Galileo was able to see only Jupiter's largest moons, Io, Europa, Ganymede, and Callisto, because these moons are the largest and brightest of Jupiter's many satellites. Their size and brightness made them visible using the relatively primitive telescope technology available to Galileo in the 17th century. Smaller moons may have been too faint to be seen with his telescopes.
The Galileo spacecraft collected information about Jupiter and it's moons ; see related link below .
Galileo Galilei, when he trained his new telescope on the sky.
Galileo observed the Moon's craters and mountains, the phases of Venus, the four largest moons of Jupiter, and sunspots when he looked through a telescope for the first time.
Galileo Galilei discovered the largest four moons of Jupiter in 1610. These moons are now known as the Galilean moons and are named Io, Europa, Ganymede, and Callisto.
The largest moons of Jupiter, known as the Galilean moons, were discovered by Italian astronomer Galileo Galilei in 1610. These moons are Io, Europa, Ganymede, and Callisto.
Only Jupiter, the Galilean moons are the four largest moons of Jupiter which Galileo discovered.The four satellites discovered by Galileo orbit Jupiter.
Galileo.