The energy needed to do this can perhaps explain the concept of inertia. Electromagnetical waves are waves but can in some unknown way be quantisized to packets called fotons. This means that there is a limitation to the complementarity between the concepts of particle and wave. Eruptions on the sun do not affect the center of gravity for the sun plus the eruption. This means that these waves are attenuated very fast with distance and are not possible to detect on earth.
Light travels down faster than up .
Michelson studied only light travelling horisontally.