Abstract. The subject of 'cosmic rays' is one that embraces a vast range of particle and photon energies and is an ideal one for examining 'Physics and the Cosmos'. In the present work we examine the problem of the origin of cosmic rays of all energies. We find that low cosmic ray particles and gamma rays are related by studies of the Magellanic Clouds. At higher energies it is proposed that supernova remnants are giving a characteristic cosmic ray signal. At the highest energies it is proposed that colliding galaxies are important.

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