No. Mars can be seen with the naked eye and has been known since before there were written records. The only new solar system objects that Galileo discovered were the four largest moons of Jupiter.
Galileo did not discover Mars, mars has been known to exist since ancient times.
He didn't. Mars is visible to the naked eye; it has no single discoverer. It has been known sice ancient times, thousands of years before Galileo was born.
In the early 17th century
No. American astronomer Asaph Hall, working at the U.S. Naval Observatory, discovered them in August of 1877.
Galileo DID NOT discover Mars. Mars has always been visible from Earth to the unaided human eye and was known to and named by our ancient ancestors. Galileo is believed to be the first person to view Mars though a telescope in 1609.
No, Venus was already known of in Galileo's time.
nope
yes Galileo Galilie discovered Saturn
Galileo's greatest discovery was the discovery of jupiter's moons and rings.
In astronomy, he used a telescope.
Sun spots
he discovered it on