<span>Primarily, Nicolaus
Copernicus formulated the model of the universe that it was the sun, placed at
the center of the universe, rather than the Earth. It is widely accepted nowadays because of the
reason that modern scientific discoveries proved that the Earth and other
planets revolved around the Sun. Though
the Sun is not the center of the universe, but it is the center of the solar
system.</span>
<span>Before Copernicus introduced
this model, people in the past long believed and accepted the model that the
Earth was the center of all so it was hard for the people to immediately accept
his model.</span>
