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 other theory was the heliocentric or Copernican theory which held that the sun was the center of the universe and that day and night were due to the rotation of the earth. This theory was named after a Catholic canon, Nicolaus Copernicus, who published a book on it 21 years before Galileo was born.he other theory was the heliocentric or Copernican theory which held that the sun was the center of the universe and that day and night were due to the rotation of the earth. This theory was named after a Catholic canon, Nicolaus Copernicus, who published a book on it 21 years before Galileo was born.