From: JeffRelf.F-M.FM on

“ How does the relativistic·mass of a particle increase with speed ? ”,
you ( Sanny ) should've asked.

“ rest·energy = rest·mass * the·constant ”;
“the·constant” is “c^2”; in “God's units”, c is 1.

“ relativistic·mass = rest·mass * gamma ”;
gamma is “ ( 1 - v^2 / c^2 )^-.5 ” and v is the “relative·velocity”.

Though it's beyond measurement, the cosmos is perfectly causal;
all changes ― all randomness ― is “virtual”, “notional”, not real;
the future is just as fixed as the past, static, immutable.

Imprecise measurements are why you have to ask “why”.

“ What are the chances of someone, someday,
observing a particle moving faster than c ? ”, you should've asked.

Too low to matter.
Imprecise measurements are why you have to ask “why”.

If one photon is heading towards you from the left,
and another from the right, their “closing velocity” is 2c;
note, neither photon is moving faster than c.