Calculate the percent of the total irradiance for wavelengths with photon energies greater than or equal to the Si bandgap (1.1eV) for AM0 and AM1.5d (direct).

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According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?