Light Emitted at 450,000 km/h from a Flying Atom
When a hydrogen atom flies at half the speed of light, namely 150,000 km/h, time passes slowly on the atom.
Assume that time ticks at half the pace on the still ground. Accordingly when the atom emits light forward at 300,000 km/h (the universally specified speed of light), the light looks like being emitted at 150,000 km/h from the ground, since time on the ground progresses twice faster than on the atom.
But as the atom flies at 150,000 km/h, it looks virtually flies at 300,000 km/h from the ground, since 150,000 + 150,000 = 300,000. So, you on the ground may think that the speed of light is always 300,000 km/h if it is emitted from an atom flying very high at half the speed of light.
Now, if the atom emits light backward, what would happen? If the atom emits light backward, the speed of light is always the same, 300,000 km/h for the atom. Direction, forward or backward, doesn't matter. For the atom flying at a steady velocity of 150,000 km/h, it feels as if it stood still. So, light is always emitted at 300,000 km/h to any directions.
But, on the rear of the atom, time ticks faster. On the front side of the atom, it ticks slower. Time passes slowly on the advancing side of the atom, but it passes faster on the back side facing the opposite direction. So, time passes faster on the rear side of the atom than on the ground.
Accordingly, the light emitted backward from the atom should momentarily look flying at 450,000 km/h from the ground, though it has been emitted at 300,000 km/h for the atom. As the atom advances forward at 150,000 km/h, eventually the light flies at 300,000 km/h (450,000 - 150,000 = 300,000) for an observer on the ground.
Therefore, light always flies at 300,000 km/h for the observer on the ground, no matter if the high-fast atom emits light forward and backward constantly at 300,000 km/h in its observation.
The point at issue is that time ticks slowly on the front side of an atom flying high and it passes faster on the rear side of the atom.
So, the atom, observed from the ground, looks like emitting light forward at half the normal speed of light (at 150,000 km/h) while emitting light backward at 1.5 times faster than the normal speed (at 450,000 km/h). But eventually, by adding or subtracting the speed of the atom, 150,000 km/h, the light always looks like flying at its normal speed of 300,000 km/h forward and backward alike if observed from the ground.
It is a result of interaction between the mass of the atom and space.
It looks like a fish swimming upstream on the river. Its head feels time passing slowly due to strong resistance from water, but its tail feels time passing faster due to less water pressure.
But why does time pass 1.5 times faster on the rear of a flying atom than on the ground while it passes 2 times slower on the front side of the atom than on the ground? Can fluid dynamics give a clue?
Anyway, the primary effect should happen on the front side and the secondary effect on the rear side as this phenomenon is cased by the atom flying forward. So, some distinction should be needed: 1/2 and 3/2 (a half plus 1.5 is 2, or -0.5 + 1.5 = 1.0 ). Totally, the time rate can be preserved if it means minus 0.5 plus 1.5.
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Act 3:13 The God of Abraham, and of Isaac, and of Jacob, the God of our fathers, hath glorified his Son Jesus; whom ye delivered up, and denied him in the presence of Pilate, when he was determined to let him go.
Act 3:14 But ye denied the Holy One and the Just, and desired a murderer to be granted unto you;
Act 3:15 And killed the Prince of life, whom God hath raised from the dead; whereof we are witnesses.