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I would like to know if the ancient people like Copernicus, and even before them, had good knowledge about the stars for they were much closer than today, that's if the bigbang theory is correct.
There have been many pole stars throughout the millennia. Around 2000 BC, the star Eta Hydri was the nearest bright star to the Celestial south pole. Around 2800 BC, Achernar was only 8 degrees from the south pole.
... Why does the outer gas planets reflect light at nighttime, also gas fusions or what.
the internal energy leftover from the formation makes Jupiter self-luminous, radiating away more energy than it receives from the Sun.