Obs. : 2012-06-13 Planet Ly alpha (photons/cm^2/sec) Mercury 4.192e+11 Venus 4.335e+11 Earth 4.460e+11 Mars 4.224e+11 Jupiter 4.381e+11 Saturn 4.359e+11 Uranus 4.433e+11 Neptune 4.444e+11 Pluto 4.455e+11