they went against the church teachings and authority
Galileo was put in prison for writing about his findings. He had gone against the teaching of the Catholic church.
Galileo was allowed to publish his findings as theory, which was a major relaxation of Catholic doctrine. Instead, he published them as fact.
When Galileo published his scientific findings about the heliocentric nature of the universe he was tried and condemned as a heretic by the Roman Catholic Inquisition
His findings frightened both the catholic and Protestant leaders because they went against the church teachings and authority. The conflict was solved when Galileo stood before court and knelt before the cardinals and read aloud a signed confession in which he agreed that the ideas of Copernicus that he said were real, we're false.
he was invention man
Galileo Galilei first recorded phases in Venus in 1610, and published his findings in 1613.
It was based upon observation and experimentation.
The Church did not disapprove of Galileo's work. What they disapproved of was that he was teaching his findings as fact when they were simply unproven theories. Even Galileo stated that he could not proven them.
Catholic.
It didn't "frighten" the Church. The Church was upset because Galileo was insisting on a theory that he couldn't prove, at that time - the science hadn't been invented yet. The Church allowed him to publish his theory as a theory, but not to claim it was fact until it was proved. Galileo was a very stubborn man who believed he was right (actually, his theory was right, but he couldn't prove it) and he insisted on teaching it as fact, and he insisted on making fun of the pope who was both a patron and a personal friend - this didn't go over very well with the Church. For the full story please read "The Galileo Controversy" at the link below.
Maybe, the church because his theory is diffirent from what is said to the bible.
They taught that the sky was perfect and unchanging.