Obs. : 2015-02-26 Planet Ly alpha (photons/cm^2/sec) Mercury 4.392e+11 Venus 4.605e+11 Earth 4.629e+11 Mars 4.605e+11 Jupiter 4.625e+11 Saturn 4.267e+11 Uranus 4.618e+11 Neptune 4.488e+11 Pluto 4.197e+11