http://www.ikaro.com/Hasslberger/phy_1.htm
where the author says that because if photons are responsible for light (and
not waves), and photons have mass, then energy must be expended to move
them. Because light can be seen over billions of light years, then if
photons are responsible for light then an enormous amount of energy must be
responsible to shift them. He reckons this is ridiculous and supports the
wave theory. Waves need something to travel thru, that substance is the aether.
Without getting into debates ober the red shift and doppler effects, that
idea seems to be sensible.
Dr Jones