On Sun, Jan 28, 2018 at 12:32 PM, <mix...@bigpond.com> wrote:

...which would make sense if light simply followed the curvature of space.

The curvature of spacetime is perhaps an abstraction that gets in the way
of understanding in this instance.  It is equivalent to the gravitational
influence of two or more bodies on one another.  Having a massive body be
able to tug on a photon, while the photon does not tug on the massive body
in the opposite direction, reminds me vaguely of a description of a rowboat
with oars, where the rower is somehow able to use the oars to push the boat
forward, while the water is not pushed in the opposite direction.

I suspect that if one ponders the suggestion of light not having
"gravitational mass" long enough, it should be possible to come up with an
experiment that will demonstrate a violation of conservation of momentum.


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