Question

the ancient Greeks developed the
model, which placed the
at the center of the solar system.

However based on his observations, Copernicus proposed the
model, which placed the
at the center of the solar system.

Answer 1

The ancient Greeks developed the **geocentric** model, which placed the **Earth** at the center of the solar system.

However, based on his observations, Copernicus proposed the **heliocentric** model, which placed the **Sun** at the center of the solar system.