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
My answer is four moons that Galileo found on or near Jupiter.
he was the first to see Jupiter
Galileo looked at the planet Jupiter and observed its 4 largest moons (which are still known as the Galilean moons, to this day).
Jupiter has 79 moons and there are 4 major moons; The Galilean moons named after Galileo.
His telescope did not contain the magnification necessary to observe Jupiter's lesser moons.
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 Galilei
Only Jupiter, the Galilean moons are the four largest moons of Jupiter which Galileo discovered.The four satellites discovered by Galileo orbit Jupiter.
Galileo.