For 10 points, name these showers of particles that originate from space.
One type of these entities are believed to be emitted by Zevatrons; one example of that subtype was detected at the Dugway Proving Ground and was called the "Oh-My-God" particle. The AMS instrument showed that these entities do not contain anti-helium atoms. The Auger Observatory was built to detect these entities. One method of detecting these entities relies on them striking stacks of polycarbonate, which are then dissolved in sodium hydroxide to reveal tracks. Their resonant interaction with the cosmic microwave background cuts (*) off their energies at the GZK limit. They were originally detected using a set of three Wulf electrometers by Victor Hess in a balloon, and they mostly consist of protons. For 10 points, name these showers of particles that originate from space.
One type of these entities are believed to be emitted by Zevatrons; one example of that subtype was detected at the Dugway Proving Ground and was called the "Oh-My-God" particle.
cosmic rays