Insofar as their speed is concerned, photons are Newtonian particles - the speed of light VARIES, both in a gravitational field and in gravitation-free space, just as the speed of ordinary projectiles does.

Einstein's false constant-speed-of-light postulate is equivalent to Big Brother's 2+2=5. Mathematics automatically becomes insane after 2+2=5 is introduced - scientists unavoidably get trapped in idiotic "paradoxes". Exactly the same happened to fundamental physics in 1905:

"Lee [Smolin] and I discussed these paradoxes at great length for many months, starting in January 2001. We would meet in cafés in South Kensington or Holland Park to mull over the problem. THE ROOT OF ALL THE EVIL WAS CLEARLY SPECIAL RELATIVITY. All these paradoxes resulted from well known effects such as length contraction, time dilation, or E=mc^2, all basic predictions of special relativity. And all denied the possibility of establishing a well-defined border, common to all observers, capable of containing new quantum gravitational effects." Joao Magueijo, Faster Than the Speed of Light, p. 250 http://www.amazon.com/Faster-Than-Sp.../dp/0738205257

Yes, the root of all the evil in physics is special relativity, or more precisely, Einstein's false constant-speed-of-light postulate. Physicists know that and even try to tell the truth sometimes but there is a problem. Today's physics is entirely predicated on the false constancy and will collapse without it. In this regard telling the truth is suicidal:

"The whole of physics is predicated on the constancy of the speed of light," Joao Magueijo, a cosmologist at Imperial College London and pioneer of the theory of variable light speed, told Motherboard. "So we had to find ways to change the speed of light without wrecking the whole thing too much." https://motherboard.vice.com/en_us/a...t-speed-slowed

Pentcho Valev