Obs. : 2025-09-17
Planet	Ly alpha (photons/cm^2/sec)
Mercury    7.560e+08
Venus      7.341e+08
Earth      8.244e+08
Mars       7.904e+08
Jupiter    7.667e+08
Saturn     8.155e+08
Uranus     7.839e+08
Neptune    8.155e+08
Pluto      8.596e+08