Obs. : 2018-03-29 Planet Ly alpha (photons/cm^2/sec) Mercury 3.499e+11 Venus 3.441e+11 Earth 3.436e+11 Mars 3.479e+11 Jupiter 3.463e+11 Saturn 3.479e+11 Uranus 3.441e+11 Neptune 3.558e+11 Pluto 3.487e+11