Obs. : 2016-06-03 Planet Ly alpha (photons/cm^2/sec) Mercury 4.324e+11 Venus 4.306e+11 Earth 4.086e+11 Mars 4.118e+11 Jupiter 4.115e+11 Saturn 4.086e+11 Uranus 4.311e+11 Neptune 4.170e+11 Pluto 4.200e+11