Thanks raptor5618, you raise a thought-provoking point. I have read Einstein's man in the box thought experiment and will review it again. Your placement of the box at a Trojan point is an interesting variant and it seems to me that you are fully capable of figuring out the answer. I will try...
Way back in 10/14/06, FunkyDwarf said:
“photons are said to have no mass, or specifically no rest mass, for two reasons.
...firstly because an inertial observer can never catch up with a photon and view it at rest.
secondly because mass addition requires something traveling at the...