Obs. : 2018-04-24
Planet	Ly alpha (photons/cm^2/sec)
Mercury    4.009e+11
Venus      4.001e+11
Earth      3.894e+11
Mars       3.896e+11
Jupiter    3.889e+11
Saturn     3.904e+11
Uranus     4.036e+11
Neptune    3.976e+11
Pluto      3.896e+11