Of particular significance was the detection of a single particle whose energy of 10 20 electron volts is larger than the maximum that could be contained in the galactic disc by galactic magnetic fields.
12.
The magnitude of the energy of cosmic ray flux in interstellar space is very comparable to that of other deep space energies : cosmic ray energy density averages about one electron-volt per cubic centimeter of interstellar space, or ~ 1 eV / cm 3, which is comparable to the energy density of visible starlight at 0.3 eV / cm 3, the galactic magnetic field energy density ( assumed 3 microgauss ) which is ~ 0.25 eV / cm 3, or the cosmic microwave background ( CMB ) radiation energy density at ~ 0.25 eV / cm 3.
