Galileo explains his ideas on astronomy and observation to a young boy. He demonstrates his understanding of the heliocentric theory by moving the boy around a washbowl to show that he may observe the washbowl in a new place when he in fact is the one moving.
Church officials in Rome are impressed with Galileo's mathematical knowledge but hesitate when he brings up his interest in teaching Astronomy. They worry he will be accused of heresy by the Inquisition and decide that he is better off teaching in free-thinking Venice.
Hypatia and her students ponder about the solar system and believe there is a simpler model for explaining it. A philosopher jumps in to explains the heliocentric model, as proposed by Aristarchus of Samos.