Obs. : 2025-07-17
Planet	Ly alpha (photons/cm^2/sec)
Mercury    8.167e+08
Venus      8.346e+08
Earth      8.363e+08
Mars       8.168e+08
Jupiter    8.278e+08
Saturn     8.440e+08
Uranus     8.387e+08
Neptune    8.440e+08
Pluto      8.389e+08