Obs. : 2017-04-08
Planet	Ly alpha (photons/cm^2/sec)
Mercury    4.004e+11
Venus      3.970e+11
Earth      3.651e+11
Mars       3.899e+11
Jupiter    3.577e+11
Saturn     3.725e+11
Uranus     4.017e+11
Neptune    3.923e+11
Pluto      3.750e+11