Time is the measurement of rearranging atoms.
Atoms are rearranged like blocks, and that is time.
Putting the blocks back as they were before is not going back in time.
There is no past,
there is no future,
there is only the eternal present.
There was a past, there will be a future… but you can’t get there from here,
except as the atoms rearrange.
A time machine would have to rearrange the atoms
of the world,
of the galaxy,
of the entire universe,
to put every particle back into some prior arrangement.
The calculations, let alone the actions, would be… difficult.
It is no wonder that we have never seen visitors from the future.
They don’t exist. There is no future, and there is no past.
There is only the eternal present.
Enjoy it.
*****
This “poem” was just published in Consilience, “the world’s first peer-reviewed science and poetry journal”. In addition to a poem, the journal requires a comment focusing on the science behind the poem. So here is
“The Science.
Time may be a dimension and a useful concept, but it is not a dimension in the sense of something that one can move back and forth in. We measure time with atomic clocks, which produce electromagnetic radiation that atoms in the clock absorb. Cesium atoms absorb microwaves with a frequency of 9,192,631,770 cycles per second, which then defines the international scientific unit for time, the second. Accurate time like this has helped to prove Einstein’s theories about time moving at different rates when clocks are moving at different speeds. Without accurate clocks and an understanding of Einstein’s theories about the speed of light and space-time, we wouldn’t have the Global Positioning System (GPS), which uses clocks in space and on the ground to show you where you are.”
There are limits to the amount that can be written in the Science section, so I haven’t gone into rambling speculation about the subjective aspect of time which appears to speed up as we get older. My suggestion is that we experience a ‘Subjective Time Unit’ as a constant amount of thought-processing. Say as a teenager you process 100,000 bits of information in a second (that’s a random number, but you get the point). Then as you age and the brain physically deteriorates, perhaps by age 50 it takes you two seconds to process that amount of information. You would feel the external world cycling twice as fast between day and night, because it would happen with the passing of half as many STUs. You would still think as logically, but time would feel like it was speeding up. The use of pharmaceutical uppers and downers will also change how much time you feel passes (by impacting how rapidly you are processing information), as will being half asleep (time slides by rapidly) or being in an adrenaline-enhanced emergency (time will appear to slow down).
But these are all mere speculations about the subjective nature of time, different from the question of the objective nature of time itself.
Photo: “LunarLanding – Gardens of Time” by mcscrooge54 is licensed under CC BY-SA 2.0.