  A.G. Lebed has given an argument that when a hydrogen atom is transported
slowly to a different gravitational potential, it has a certain probability of
emitting a photon. He proposes a space-based experiment to detect this effect.
I show here that his arguments also imply the existence of nuclear excitations,
as well as an effect due to the earth's motion in the sun's potential. This is
not consistent with previous results from underground radiation detectors. It
is also in conflict with astronomical observations.
