How was Copernicus' idea that the sun was at the center of the universe different? Why was his concerned about publishing his ideas?

His idea that the sun was at the center of the universe was very different than others at the time. People believed that the Earth was actually the center of the universe, and he was concerned about publishing his ideas because this was very frowned upon and he would get harshly critcized and most likely punished for this idea.

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