Researchers hope to corroborate the Virgo deficit using observatories in the Northern Hemisphere, which has a better view of the cluster. The so-called Telescope Array began operating in January in western Utah, and plans are afoot to build Auger North in southeastern Colorado. But one weak link in astronomers’ knowledge isn’t so much the cosmic-ray detection as the ordinary telescopic investigation of potential sources. Cosmic rays could help astronomers understand supermassive black holes and other phenomena. They have gone from novelty to tool.
This article was originally published with the title Catching No Rays.