What is the Universe? How did the ancient peoples imagine the universe? Who is interested in the views of Aristarchus of Samos?

Our Universe is understood as everything accessible for observation with the help of all kinds of technical devices, outer space. Ancient peoples placed themselves at the center of the universe. Therefore, their place of residence was considered a flat surface, and the observed astronomical objects attached to some huge celestial sphere were considered to revolve around them, like the main celestial bodies. The views of Aristarchus of Samos are interesting in that he first placed the Sun in the center of the Universe in the 3rd century BC.