The data on the composition of cosmic rays having an energy of 1012 to 1013 ev are reviewed. It is pointed out that these cosmic rays consist principally of 'bare'' nuclei of protons, light elements, heavy elements, and very heavy elements. Electrons and positrons compose less than 1% of the composition of the cosmic rays. It would be highly desirable to have more accurate information on the number of positrons and electrons in these cosmic rays and on the chemical composition of cosmic rays at very high energies (E> 1016 ev). A proton nucleus, or some other kind of nucleus with an energy of 1014 to 1019 ev collides with N and O atoms of the air and forms a shower of high energy particles which can be studied by a set of counters connected in coincidence. Although the energy of the primary particle can be found, the composition is unknown. Since cosmic rays fall isotropically on earth, it is conjectured that a charged particle interacts with a magnetic field and irradiates electromagnetic waves, including radio waves. It is proposed that the supernovae produce cosmic rays in large amounts and that radiowaves are also emitted in this process which canmore » be detected by the methods of radioastronomy. It is shown by a rough energy balance that supernovae explosions contain enough energy to account for the observed concentration of cosmic rays in the universe. New and more exact data about cosmic rays in supernovae and spiral galaxies can be obtained by the methods of radioastronomy and astrophysics.« less