Super-TIGER stalks cosmic rays in Antarctica
Invisible high-velocity particles rain down on Earth day in and day out, but it has taken 100 years and clever deduction for physicists to figure out what they’re made of and where they come from. Although some details are still unclear, physicists have built a case that the cosmic rays are born in volleys of supernova explosions in OB associations, loose associations of hot, massive stars sprinkled throughout our galaxy.