Editing Pierre Victor Auger (section)

==Findings==
In his work with [[Cosmic ray|cosmic rays]], he found that the cosmic radiation events were coincident in time meaning that they were associated with a single event, an [[air shower (physics)|air shower]]. He estimated that the energy of the incoming particle that creates large air showers must be at least 10<sup>15</sup> [[electronvolt]]s (eV) = 10<sup>6</sup> particles of 10<sup>8</sup> eV (critical energy in air) and a factor of ten for energy loss from traversing the atmosphere.<ref name="bio"/><ref>{{cite journal | author=P. Auger|  title= Extensive Cosmic-Ray Showers  | journal=Rev. Mod. Phys. | volume=11 |  issue=3–4|  year=1939 | pages=288–291  | doi=10.1103/RevModPhys.11.288|bibcode = 1939RvMP...11..288A |display-authors=etal}}</ref>