Galileo was supported by his teacher, Ostilio Ricci.
Galileo
Galileo
Galileo
Galileo
Both Pope Gregory XV and Pope Urban VIII were involved with Galileo's case
Galileo Galilei
Galileo supported the Copernican system, but Aristotle did not. The Copernican system was a belief that the sun was the center of the solar system.
Pope Urban VII was the pope during Galileo's problems with the Church. he originally supported Galileo but dropped that support after Galileo made some rather disparaging remarks about the pope.
The two main proponents in the early days were Nicolas Copernicus and Galileo.
By looking into space with the telescope.
Yes, he was poor all of his life. Men like him had sponsors who supported their work.
Galileo's observations with his telescope supported the concept of heliocentricism. He noted that the satellites of Jupiter and Venus, based on their range of phases, did not match geocentricism supported by Ptolemy. He noted that based on these findings, that the Heliocentric theory was correct.