Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar system based only on what they could see with their eyes. Describe Ptolemy's model
of the solar system and how he came to his conclusions. Then describe Galileo's
model of the solar system. Explain how Galileo proved that his model was correct and
that Ptolemy's was not correct.
sorry i had to label this as physics, there's no astronomy label! 20 points for a good answer. :)

Explanation:

In Ptolemy's geocentric model of the universe, the Sun, the Moon, and each planet orbit a stationary Earth. He had them in circle orbits.

Galileo's model showed that the sun was the centre of the universe. That everything orbited around the earth. He also saw that they we in elliptical orbits.

Galileo proved Ptolemy wrong because Ptolemy said that everything orbited the earth and they orbited in circle but they orbit in ovals (elliptical) and that they orbit the sun.