As they zip through space, magnetic fields can deflect cosmic rays, so we have to determine their sources indirectly. When cosmic rays boosted by supernova remnants crash into gas clouds, they produce gamma rays our Fermi satellite sees: https://tmblr.co/Zz_Uqj2XaWrWy #FermiFriday | NASA Universe

When do pirates hunt for cosmic gold? During the arrr-process. When two neutron stars merge, they produce heavy elements like gold in r-process nucleosynthesis. We use NASA - National Aeronautics and Space Administration missions to spot gamma rays emitted by these sources. #NationalTalkLikeAPirateDay | NASA Universe