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.
Galileo's Work. When Galileo first turned his telescope to the moon, he had no idea that he was about to see something that would cast doubt upon centuries-old beliefs. At the time of Galileo, science was based upon the teachings of Aristotle. According to Aristotle, the Earth was the center of the universe.