Obs. : 2016-10-25 Planet Ly alpha (photons/cm^2/sec) Mercury 3.827e+11 Venus 3.737e+11 Earth 3.690e+11 Mars 3.759e+11 Jupiter 3.863e+11 Saturn 3.737e+11 Uranus 3.651e+11 Neptune 3.696e+11 Pluto 3.754e+11