What was the title of Galileo's work that brought him into direct conflict with the Catholic Church?

Answer

Dialogue Concerning the Two Chief World Systems.

Galileo's open advocacy for the Copernican system in his 1632 publication, Dialogue Concerning the Two Chief World Systems, led directly to his trial by the Roman Inquisition.

What was the title of Galileo's work that brought him into direct conflict with the Catholic Church?
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