SOLAR SYSTEM. BEFORE WE GO ON…. Cosmologist – scientist who studies how the world was formed. In the beginning…. Ptolemy (Greek) proposed a theory that planets orbited the earth (geocentric). Copernicus (Polish) changed the theory to planets orbiting the sun (heliocentric).
Cosmologist – scientist who studies how the world was
NOW FOR THE OUTER PLANETS!
This picture is floating around in outer space on a satellite to let anyone looking for life find us.