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From: moroney@world.std.spaamtrap.com (Michael Moroney)
Newsgroups: sci.physics
Subject: Re: 'Dark Matter'
Date: Wed, 29 Jul 2015 02:22:04 +0000 (UTC)
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Xref: aioe.org sci.physics:510141

john <johnsefton288@gmail.com> writes:

>Whether or not the photon hits me, the
>sun is the same.

No, the sun isn't quite the same.  The sun lost a little mass-energy by
emitting the photon (E=hf).  Your eyeball gained that energy by absorbing
it.  The sun recoiled slightly by emitting the photon (p=hf/c).  You were
thrown ever so slightly backwards by the photon's momentum when your
eyeball absorbed it.