Last name: Guerra. This unusual and interesting surname is of Old French pre 9th century origins. Recorded in many spellings including Guerre, Guierre, Laguerre (French), Guerra, Guerrero, (Spanish), Guerreiro (Portugese), Guerri (Italian), Guerriero (Sicillian), and Warr or Warre (English), the name derives from the word 'guerre' meaning 'war'.
Instead, Galileo disproved the Ptolemaic theory, sanctioned for centuries by the Church, which held the Earth to be the central and principal object in the universe, about which all celestial objects orbited.
The theory that he was exposed to at the University of Padua was a new theory that was proposed by Nicolaus Copernicus which stated that the Earth and all the other planets revolved around the sun. Also Gaileo's observations with his new telescope made him believe Copernicus's heliocentric theory.