who is galileo galilei and what is he famous for?
Mathematician Astronomer Scientist Physicist Astrologer
entailment
 In 1619 , Galileo became embroiled in a controversy with Father Orazio Grassi , professor of mathematics at the Jesuit Collegio Romano . It began as a dispute over the nature of comets , but by the time Galileo had published The Assayer ( Il Saggiatore ) in 1623 , his last salvo in the dispute , it had become a much wider controversy over the very nature of science itself . The title page of the book describes Galileo as philosopher and " Matematico Primario " of the Grand Duke of Tuscany . 

entailment
 For the next decade , Galileo stayed well away from the controversy . He revived his project of writing a book on the subject , encouraged by the election of Cardinal Maffeo Barberini as Pope Urban VIII in 1623 . Barberini was a friend and admirer of Galileo , and had opposed the condemnation of Galileo in 1616 . Galileo 's resulting book , Dialogue Concerning the Two Chief World Systems , was published in 1632 , with formal authorization from the Inquisition and papal permission . 

neutral
 1607 – Rotilio Orlandini attempts to assassinate Galileo 's friend , Friar Paolo Sarpi 

contradiction
 Galileo continued to receive visitors until 1642 , when , after suffering fever and heart palpitations , he died on 8 January 1642 , aged 77 . The Grand Duke of Tuscany , Ferdinando II , wished to bury him in the main body of the Basilica of Santa Croce , next to the tombs of his father and other ancestors , and to erect a marble mausoleum in his honour . 

neutral
 Galileo 's main written works are as follows : 
