At a collaboration meeting in San Rafael, Argentina, scientists of the Pierre Auger Project, whose goal is to discover the source of very high-energy cosmic rays, today (September 13) announced the choice of the project’s northern-hemisphere observatory.

Scientists of the Pierre Auger Project, whose goal is to discover the source of very high-energy cosmic rays, will announce the choice of the project’s northern-hemisphere observatory at a meeting in San Rafael, Argentina on September 12. The 150-member collaboration will choose among three sites: one in western Spain, one in the western U.S., and one in Mexico.