Obs. : 2013-04-20
Planet	Ly alpha (photons/cm^2/sec)
Mercury    4.926e+11
Venus      4.838e+11
Earth      4.040e+11
Mars       4.890e+11
Jupiter    4.604e+11
Saturn     4.056e+11
Uranus     4.926e+11
Neptune    4.691e+11
Pluto      4.170e+11