Obs. : 2015-03-31 Planet Ly alpha (photons/cm^2/sec) Mercury 4.774e+11 Venus 4.902e+11 Earth 4.946e+11 Mars 4.775e+11 Jupiter 5.303e+11 Saturn 4.919e+11 Uranus 4.735e+11 Neptune 4.800e+11 Pluto 4.882e+11