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Questions for Discussion: Galileo: Sun-Centered System

How was Galileo able to provide additional evidence for the Sun-centered universe?
How did Galileo's observations of the phases of Venus persuade him of the true nature of the solar system?
Do some research on the public's reaction to Galileo's "Dialogue Concerning the Two Chief World Systems." What repercussions did he face?
What role did Copernican theory play in influencing Galileo's discoveries?
Discuss the role of observation in science, using Galileo as an example.