Obs. : 2014-07-04 Planet Ly alpha (photons/cm^2/sec) Mercury 3.636e+11 Venus 3.636e+11 Earth 4.774e+11 Mars 4.387e+11 Jupiter 3.578e+11 Saturn 4.463e+11 Uranus 3.902e+11 Neptune 4.332e+11 Pluto 4.774e+11