Obs. : 2014-10-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.997e+11 Venus 3.830e+11 Earth 4.029e+11 Mars 4.186e+11 Jupiter 3.883e+11 Saturn 4.087e+11 Uranus 4.032e+11 Neptune 4.092e+11 Pluto 4.183e+11