Abstract
Freundlich's data are analysed and it is shown (i) that the energy loss leading to the observed red-shifts is most probably taking place in the stellar atmospheres; (ii) that neither the Compton effect nor photon-photon interaction in the form considered by Euler and Kockel can account for the effect; (iii) that if the red-shifts are due to a photon-photon interaction effect, the cross section is at least of the order of 10-23m2, and if they are due to photon-electron interactions the lower limit for the cross section is about 10-21 m2; (iv) that a photon-electron interaction is more likely to be the cause of the red-shift than a photon-photon interaction.

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