Obs. : 2015-02-25 Planet Ly alpha (photons/cm^2/sec) Mercury 4.633e+11 Venus 4.844e+11 Earth 4.804e+11 Mars 4.844e+11 Jupiter 4.797e+11 Saturn 4.399e+11 Uranus 4.831e+11 Neptune 4.723e+11 Pluto 4.416e+11