Obs. : 2016-03-15 Planet Ly alpha (photons/cm^2/sec) Mercury 4.387e+11 Venus 4.348e+11 Earth 4.219e+11 Mars 4.212e+11 Jupiter 4.144e+11 Saturn 4.226e+11 Uranus 4.421e+11 Neptune 4.348e+11 Pluto 4.245e+11