From a drop of water....

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"Repetition is the heart of instruction." Gen. George S. Patton, Jr.
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I've found over the coarse of time what deals in time dilation and it isn't any object traveler:

Light at the constant of the speed of light takes a longer and longer SPACETIME to cross a lengthening or longer distance of SPACE, thus (light itself the thing) dealing in time dilation across a lengthening divide.

Light itself deals in time dilation over lengthening distances, thus though holding to a constancy of speed, does not, cannot, hold to it over changes in space and time. Light's speed, itself, would be infinity if could measure space and time distance to cross it instantly (as some think (unable to envision differently), and tell us regularly in cosmological captions, it does ("an astronomical event just observed 70,000 light years away just happened" (thus no intervening time difference in the observation of it)!

A traveler (and not light at the speed of light) will split universes of observation into two or more universes dealing in a macrocosmic self-similar representation of the microcosmic Heisenberg uncertainty principle.

Once more, photonic photo-frame light itself is the only traveler that will always slow down or speed up in aging according to the divide crossed.
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"Communication across the revolutionary divide is inevitably partial." -- Thomas S. Kuhn.
 
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We know how Galaxies form.
Elliptical, Bar, Spiral, and exotic ones.
It's just amazing what man can achieve in the modern Era.
We know how they merge
We know how they can be pulled by other galaxies to pieces.
We can also determine the ages of galaxies.