Obs. : 2017-03-03 Planet Ly alpha (photons/cm^2/sec) Mercury 3.198e+11 Venus 3.203e+11 Earth 3.120e+11 Mars 3.189e+11 Jupiter 3.133e+11 Saturn 3.132e+11 Uranus 3.189e+11 Neptune 3.198e+11 Pluto 3.143e+11