Copernicus proved to mankind that the sun was the center of the universe, not the Earth. We know now that he was mostly correct. The sun is the center of the solar system.
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Johannes Kepler
Nicolas Copernicus did not use a telescope, the use of the telescope to study the solar system was not done until over 50 years later by Galileo.
the ideas would prove all knowledge to be wrong
Because he didn't invent the Telescope so he saw it from his naked eye
The only part of Copernicus's theory that Kepler retained was the idea that the Sun is at the centre of the Solar System.