He knew about 6 planets. See the related link for further information.
Copernicus believed that the Sun was at the center of the universe, not the earth. It's very conter-intuitive, but he realized that such a model would best fit the way that the planets behaved. Unfortunately, he also believed that the planets rotated around the Sun in perfect circles. Thus, his theory didn't work any better than the Earth-centric models. It was only when Kepler proposed that the planets moved in elipses around the Sun that we finally had a model that could accurately predict the motions of the planets. Copernicus laid the groundwork and Kepler (and many others) finished what he'd started.
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Copernicus devised a new model of the planets' movements among the stars. To do this he made modifications to the ancient Ptolemaic system. Copernicus considered that the ancient model was geometrically complicated and that it could be simplified very much by placing the Sun at the centre, instead of the Earth. This was controversial because the Ptolemaic model had been around for well over 1000 years and had been incorporated into the scriptures, and it was believed the Earth is at the centre. Not only was it believed but it was also religious dogma. In the end Kepler came up with a new model of elliptical orbits that was shown to be right many years later after the law of gravity and the laws of motion had been discovered. Kepler's theory is the one that is still in use today. Kepler's theory retained Copernicus's idea of placing the Sun at the centre, so Copernicus was proved right in the end, although during Copernicus's lifetime he had no way of knowing it.
Nicolas Copernicus was influenced by his uncle, after his father died when Nicolas was only ten. His uncle educated him. Also, note people spell his name many different ways so pick which one i guess..
Nicholas Copernicus was afraid that no one would accept his theory so he did not release his book until the year of his death. Many say that he died with his book in his hands on his death bed.
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We can never know how many planets there are in the entire universe.
Copernicus believed that the Sun was at the center of the universe, not the earth. It's very conter-intuitive, but he realized that such a model would best fit the way that the planets behaved. Unfortunately, he also believed that the planets rotated around the Sun in perfect circles. Thus, his theory didn't work any better than the Earth-centric models. It was only when Kepler proposed that the planets moved in elipses around the Sun that we finally had a model that could accurately predict the motions of the planets. Copernicus laid the groundwork and Kepler (and many others) finished what he'd started.
Many astronomers, historians, regular people, and scientisis know about the planets in our Solar system.
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Copernicus is mainly known for his revolutionary proposition of a heliocentric universe - that is to say, he hypothesized that the sun was the center of the universe. The generally accepted idea prior to Copernicus's theory was that the universe was centered around the Earth. We now know that Copernicus was also wrong, as the sun is one of many stars in the Milky Way, one of many galaxies.
There are 5 altogether.
No. We know what the stars are. They are not planets. They are distant suns, many of which do have undiscovered planets.
The similarity is that both theories used a system of circles and epicycles to explain how the planets move around. Copernicus's theory (1543) used a similar number of epicycles, but many of them were smaller so that the paths followed by the planets were geometrically simpler. The difference was that Copernicus placed the Sun at the centre rather than the Earth as the ancient theory had done. Another theory was later produced by Kepler (1609), which used Copernicus's idea of having the Sun at the centre, but Kepler used elliptical orbits for the planets. This new model fitted observational measurements better, but it was not until many years later after the discovery of the law of gravity and the laws of motion (1687) that it was possible to pick out Kepler's theory as the correct one that is still in use today.
Not much, both believed in heliocentrism. That planets revolve around the sun and not everything around the earth, which was the belief that many including the Catholic Church insisted on. Copernicus believed they travelled in circles, and later thanks to Kepler we know they are eliptical. Galileo never accepted this.
one for now (at least publicly disclosed ;) )
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