Uncle Al (of Irvine) Photons going through the vacuum of space,glass
water,or super cold sodium never slow down.. It takes photons to get
from the core of the Sun to its surface 100,000 years,and here the right
theory is used. In Cambridge Mass. super cold sodium(almost at absolute
zero they claim slowed photons down to 3mph "that is a laugh".
Reality is its this super cold condition that would cause photons
travelling through to be absorbed reflected,and absorbed over and over
again. These photons are covering a great distance,and that is giving
the measurement of them slowing down. Best to think greater distance
than think a photon can go 3mph However if you claim you can get
photons to go at 3mph you will get your name in a science book,and such
was the case. Your nephew Bert