One of the problems faced by Galileo was his persecution by the Roman Catholic Church. Galileo Galilei was an Italian mathematician, philosopher, astronomer, and physicist who contributed immensely to science as a whole, due to his enormous scientific discoveries and inventions.
During this period, he was persecuted by the Roman Catholic Church because his scientific discoveries didn't go with the beliefs of the Church. History has it that Galileo was also a devoted Catholic, but the Catholic didn't see him as one because of his scientific discoveries.
As a result, he was tried by the Roman Catholic Church, and they found him guilty of heresy, then he was sentenced to indefinite imprisonment till his death in 1642. The controversy that led to the arrest of Galileo was his argument that the Earth revolves around the sun, while the Church believed otherwise. Galileo said the sun is the center of the world, while the Church argued that it was the Earth.