Nicholas Copernicus 1473-1543 was a Polish priest and astronomer who created an alternative model of the planets which put the Sun at the centre, instead of the Earth as generally accepted at that time.
He knew it would get him into trouble with the church, and his book 'De Revolutionibus' was not published until the year he died. The theory with the Sun at the centre was similar to the old Ptolemaic system with its collection of circles and epicycles allowing for the changes in distance and the changes in planets' speeds, and their departure from the ecliptic.
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From watching the sky, Copernicus learned that the universe was Heliocentric, (meaning: centered around the sun.)
Easy, he used his innate ability to research and use the scientific method to discover insightful things about the universe. Also, the world is flat.
Copernicus' discovery that the Earth revolves around the Sun, also known as the heliocentric model, challenged the prevailing geocentric view held by the Catholic Church. This caused controversy and sparked opposition from some religious authorities. However, Copernicus is considered a pioneer of the Scientific Revolution and his discovery ultimately revolutionized our understanding of the universe.
Nicolaus Copernicus found out what happens with the Earth's movements.
It did not help the universe at all but it did help us in the continuing efforts to understand the universe.
An alternate term for discovery is "find" or "uncovering."
Copernicus hypothesized (discovered) that the Sun is the center of the universe and that the Earth isn't. (Actually the Sun is not the center of the Universe but it its the center of our solar system). At that time the church thought that the Earth was the center of the universe and they thought that they were right all the time and Nicolas Copernicus proved them wrong and they got angry at him for doing that because a lot of people didn't trust the church any more.