They are called astronomers.
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Yes, if he did not study anything beyond the Earth, he would not be an astronomer!
Yes there are, in my opinion, but if you go by the facts, I don't know.
Aristotle's earth-centered theory of the universe is called geocentrism. It posited that the Earth was stationary at the center of the universe, with celestial bodies orbiting around it in perfect, circular paths.
As there is currently no confirmed evidence of anything existing outside our universe, it is not possible to determine the next closest object to Earth. The concept of distance and objects beyond our universe is purely speculative and theoretical at this point.
This was called geocentrism.