On Fri, Jan 26, 2018 at 3:58 PM, <mix...@bigpond.com> wrote:

Below: The conversion of matter into energy causes spacetime, and thus the
> universe, to expand, since light has inertial but no gravitational mass.

Note that this sets up the weird situation of photons being influenced by
gravity (e.g., gravitational lensing, the Schwarzschild radius of a black
hole), but not having a reciprocal influence in return.


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