Obs. : 2018-03-08 Planet Ly alpha (photons/cm^2/sec) Mercury 3.504e+11 Venus 3.516e+11 Earth 3.521e+11 Mars 3.485e+11 Jupiter 3.485e+11 Saturn 3.481e+11 Uranus 3.504e+11 Neptune 3.520e+11 Pluto 3.480e+11