yes.
astronomy,mathematics,physics and philosophy
Some of Galileo's most significant work was in the field of kinematics, identifying that the total ...by him (or to be written by him) were forbidden, though this latter part was not enforced. ... Galileo Galilei - major areas of study ...
Galileo Galilei
Galileo Galilei first used the "new" telescope in 1609
Astronomy, physics, and mathematics.
Galileo Galilei.
astronomy space telescope
Galileo Galilei [-:
Galileo Galilei was an Italian polymath who lived in the 16th and 17th centuries. He made significant contributions to the fields of physics, astronomy, and mathematics. Galileo is often referred to as the "father of observational astronomy" for his pioneering use of telescopes to study the night sky.
Galileo Galilei was a leader in the field of science, particularly in the development of the scientific method and observations in astronomy. However, he was not a political or military leader in the traditional sense.
he improved the telescope and he studied things about astronomy...
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.