Obs. : 2025-07-23
Planet	Ly alpha (photons/cm^2/sec)
Mercury    7.991e+08
Venus      8.080e+08
Earth      8.515e+08
Mars       8.130e+08
Jupiter    7.942e+08
Saturn     8.661e+08
Uranus     8.497e+08
Neptune    8.661e+08
Pluto      8.470e+08