differences in the speed of C

From: RustyJames <extremesoundandlight@xxxxxxxxx>
Date: Wed, 7 Jan 2009 07:09:45 -0800 (PST)

A comparison of neutrino and photon speeds from supernova SN1987A puts
a limit of about 1 part in 108 on their speed difference.

whats your take on why light in this instance abouve is shown not to
always be the photons traveling at C
.

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