Obs. : 2016-03-18 Planet Ly alpha (photons/cm^2/sec) Mercury 4.460e+11 Venus 4.462e+11 Earth 4.225e+11 Mars 4.290e+11 Jupiter 4.249e+11 Saturn 4.317e+11 Uranus 4.404e+11 Neptune 4.462e+11 Pluto 4.340e+11