Obs. : 2014-01-26 Planet Ly alpha (photons/cm^2/sec) Mercury 4.232e+11 Venus 3.878e+11 Earth 4.084e+11 Mars 4.078e+11 Jupiter 4.084e+11 Saturn 3.953e+11 Uranus 4.272e+11 Neptune 4.232e+11 Pluto 3.878e+11