My answer is four moons that Galileo found on or near Jupiter.
Galileo discovered four moons of Jupiter: Io, Europa, Ganymede and Callisto. He also discovered the phases of Venus and its sunspots.
Io, Europa, Ganymede and Callisto.
Galileo did not discover Saturn. It was know of by the ancients. It can be seen at certain time without the aid of instruments.
Galileo discovered Saturn's Rings in 1610
My answer is four moons that Galileo found on or near Jupiter.
Galileo
Galileo
Galileo discovered Ganymede in 1610. Ganymede is the largest moon in the solar system and belongs to Jupiter.
Jupiter is known since ancient times, and Galileo lived from 1564 till 1642. He did discover, in connection to Jupiter, its four largest moons: Io, Europa, Ganymede and Callisto.
Galileo discovered four moons of Jupiter: Io, Europa, Ganymede and Callisto. He also discovered the phases of Venus and its sunspots.
Ganymede was discovered on January 13th 1610 by Galileo Galilei. On January 11th he observed what he believed were three stars near Jupiter. The next night he noticed that they had moved. He found a fourth "supposed" star, which turned out to be Ganymede. Galileo in 1609.
Io, Europa, Ganymede and Callisto.
4 actually, Io, Europa, Ganymede, Callisto
They are the four moons which Galileo discovered: Callisto, Europa, Ganymede and Io.
No, Venus was already known of in Galileo's time.
Galileo did not discover Saturn. It was know of by the ancients. It can be seen at certain time without the aid of instruments.