Obs. : 2014-08-29 Planet Ly alpha (photons/cm^2/sec) Mercury 4.093e+11 Venus 4.113e+11 Earth 4.203e+11 Mars 4.093e+11 Jupiter 4.098e+11 Saturn 4.093e+11 Uranus 4.163e+11 Neptune 4.186e+11 Pluto 4.167e+11