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.
Using the new technology of the telescope, Galileo discovered the moons of Jupiter: Io, Europa, Calisto, and Ganymede, thus proving that not all things orbit around the Earth, lending great support to the Copernican model of the heliocentric system.e was an Italian scientist of the 17th century. He did not prove  the heliocentric theory. But everyone accepts the heliocentric  principle now, after it was proved right; â¦ but that happened long  after Galileo's time, after new scientific discoveries in the  latter half of the 1600s. Geoff Canyon.