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correction:
E = mc² assumes rest.
Rest does not exist.
Therefore E = mc²
is always incomplete.
Always missing the
momentum term.
Always an approximation.
Valid approximation
for slow objects.
Invalid at cosmic scales.
Where everything moves fast.
Where the momentum term
is not negligible.
Where the full equation:
E² = (mc²)² + (pc)²
is required.
And at the limit:
Pure energy (photon).
m = 0.
E = pc.
Pure momentum.
No mass.
All motion.
The other extreme
from pure mass.
BETWEEN THEM:
Everything that exists.
Some mass. Some motion.
Always both.
Never just one.
Never just mass.
Never just energy.
Always the combination.
Always moving.
Always E² = (mc²)² + (pc)².
It will agree physics