Also on a massive scale, there's the Pierre Auger cosmic ray observatory. It covers an area about the size of Rhode Island. https://en.wikipedia.org/wiki/Pierr

Also on a massive scale, there's the Pierre Auger cosmic ray observatory. It covers an area about the size of Rhode Island. https://en.wikipedia.org/wiki/Pierre_Auger_Observatory https://en.wikipedia.org/wiki/Pierre_Auger_Observatory