Obs. : 2018-06-20
Planet	Ly alpha (photons/cm^2/sec)
Mercury    3.776e+11
Venus      3.800e+11
Earth      3.834e+11
Mars       3.752e+11
Jupiter    3.848e+11
Saturn     3.808e+11
Uranus     3.758e+11
Neptune    3.709e+11
Pluto      3.776e+11