Obs. : 2017-04-04
Planet	Ly alpha (photons/cm^2/sec)
Mercury    4.002e+11
Venus      3.881e+11
Earth      3.691e+11
Mars       4.008e+11
Jupiter    3.712e+11
Saturn     3.740e+11
Uranus     3.965e+11
Neptune    3.840e+11
Pluto      3.761e+11