There is a far more interesting open question.
We assume that photons "fly" straight. Of course this work fine for
short distance but does this also hold for millions, trillions of
kilometers?
Because all mass inherently rotates all mass inherits a minimal angular
momentum. We also know that all coupled rotating mechanical systems
follow a toroidal path. So in fact the universe must have toroidal
substructures. As matter deviates light a photon can easily travel a
circle around the universe torus and you theoretically could get back
the photon you once emitted.
J.W.
On 30.08.2022 19:32, H LV wrote:
When a medium at rest is moved by a wave pulse does the wave pulse
create a locally small variation of density in the medium? If it does
then wouldn't some of the energy of the wave pulse be reflected back
to the source of the wave pulse?
If this is true then perhaps something analogous can happen to light
so that the observed CMB would be the echo of light from our own Sun
and the redshift of a remote galaxy would be the result of light
energy being reflected back to that galaxy. (According to the theory
of special relativity this is a flawed analogy since it says no medium
or aether is required for light, but as far as I know no experimental
tests of special relativity have looked for reflections from the aether.)
Harry
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