Lesson 7.1: Models of the Solar System

The arrangement of the known planets and how they move around the sun was first worked out by

People became convinced that the heliocentric model was correct after evaluating evidence from

Galileo discovered

Earth is at the center of the revolving planets and stars in a(n)

In ancient times, people could not accept that the sun was the center of the universe.

This is an oval shape, such as the planets' orbits.

In the late 1500s, Ptolemy's observations were supplanted by those of

Helios is the Greek word for

Ge is the Greek word for