Galileo discussing the discoveries he made with his telescope with the church
The representative from the church (the Pope?) is thinking of hitting Galileo on the head with his telescope in order to shut him up.
The joke is that Galileo’s telescope made the discoveries and the church wants to use Galileo’s telescope to silence him
A cartoon about anti-scientific religious thinking, suppression of knowledge, fundamentalism, religion, doctrine, the Dialogue Concerning the Two Chief World Systems, Galileo Galilei, pope Urban VIII