He literally put his life on the line advocating that the church (which believed that the earth was at the center of the universe and that the sun revolved around it because of their interpretation of The Bible) look to science first when trying to solve problems in nature.
The church tried him, threatened him with torture and execution, and eventually he recanted so as not to be tortured to death.
People in the same era were simply burned to death for lesser heresies, Galileo was a bishop in the church and a friend of the pope, so he got away with a lot more. I think of him as the Lenny Bruce of science. Just like LB is a big part of the reason why people like george carlin don't get arrested for their comedy, Galileo is a big reason why people don't (anymore) get arrested for teachings evolutionary Biology and other subjects.
Modern astronomy.
From 1609 till his death.
Galileo !
Galileo Galilei studied physics, astronomy, mathematics, and the scientific method. He is best known for his work in the field of astronomy, where he made significant contributions to the understanding of the motion of celestial bodies and the structure of the universe.
He discovered the four moons of Jupiter.
I believe that at the time of Galileo and other pioneers in astronomy there was no formal astronomy study; he (and others) must have learned most of what they knew by themselves.
Galileo Galilei
Astronomy
Modern astronomy.
yes.
Yes
In astronomy, he used a telescope.
astronomy and philosophy.
From 1609 till his death.
Astronomy/physics
Galileo
Galileo !