Obs. : 2015-01-30 Planet Ly alpha (photons/cm^2/sec) Mercury 4.888e+11 Venus 5.107e+11 Earth 5.128e+11 Mars 5.196e+11 Jupiter 5.052e+11 Saturn 4.691e+11 Uranus 5.216e+11 Neptune 5.107e+11 Pluto 4.793e+11