4 Galileo Galilei : Galileo was a famous astronomer who lived from 1564 – 1642. Galieo’s inventions were revolutionary, but some of the theories he discovered because of him, put him in hot water with the church. He disproved much of what Aristotle taught, and the church believed that what he believed went against the bible. Galileo created the most efficient telescope of his time, and used this to support the theory that the earth wasn’t the centre of the universe, and that it actually revolved around the sun. Because of his controversial beliefs Galieo was put in prison until he repented. Even when he was allowed out, he was put under house arrest, and was forbidden from publishing his work, although some were smuggled out of the country, and published elsewhere.