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.
As a result of this, many sources accredit Galileo as its discoverer. He also discovered the first four moons of Jupiter, which were named J1, J2, J3, and J4. This was a historic discovery which altered the course of astronomical science to a great extent. Galileo's observations of Jupiter also led to the end of the age-old myth that the Earth was the center of the solar system, while all the other objects in the sky revolved around it.