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It's someone that proved that the earth wasn't themiddleof the universe but the sun was the end.
His theory was that the earth revolves around the sun, as opposed to the popular belief at the time that the sun revolves around the earth. He was right. Yes, Copernicus was eventually proven to be correct. But at the time he said he could not prove his hypothesis and taught it as just that - an hypothesis. He never got himself in trouble with the Catholic Church. Galileo, on the other hand, picked up the theory of Copernicus and taught it as proven fact, which it wasn't. THAT is what got Galileo into trouble. He actually had many supporters in the Church, including the pope.
Nicolaus Copernicus's scientific ideas regarding the universe and specifically the idea of heliocentrism were at odds with the generally accepted ideas of his time. It was difficult for people to accept these new ideas, made even more difficult by the Catholic Church's powerful opposition to them for some time.