This was not one particular scientist - as far as we know. It was the generally accepted idea in antiquity. Perhaps the idea started from one particular scientist, but in that case, his name is probably lost.
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Astronomer Claudius Ptolemy is a famous scientist who proposed the geocentric model, which suggested that the Earth was at the center of the universe with all other celestial bodies orbiting around it. This theory dominated scientific thought for over a thousand years, until Copernicus and Galileo proposed the heliocentric model.
Earth's scientist have not found life on other planets to date.
Heliocentric was thought to believe that the sun was at the center of the solar system and that the planets revolved around the Sun. Geocentric was thought to believe that the earth was the center of the solar system and that the planets revolved around the earth. We now know that our solar system is centered around the sun and is heliocentric.
They believe the planets formed from a disc of gas and dust called a "protoplanetary disc".
Pythagoras believed that there was a massive fireball in the center of the Earth
Galileo Galilei believed that the Earth was not the center of the universe, contrary to the prevalent belief at the time. Instead, he supported the heliocentric model proposed by Copernicus, which positioned the Sun at the center of the solar system with the Earth and other planets orbiting around it.