Obs. : 2015-03-30 Planet Ly alpha (photons/cm^2/sec) Mercury 4.775e+11 Venus 4.836e+11 Earth 4.964e+11 Mars 4.761e+11 Jupiter 5.424e+11 Saturn 4.891e+11 Uranus 4.744e+11 Neptune 4.801e+11 Pluto 4.885e+11