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In my limited understanding, the Planck time and Planck length aren't necessarily the smallest possible values for time and space respectively. I think those values just represent a limit on how finely we can theoretically measure time and space. Any length or time below that scale can't be distinguished from zero. Someone do correct me if I'm wrong about that.

- Some people are searching for evidence that we live in a simulated universe.

Planck length has no significant meaning, physically......................... It is just a length which light travels in one unit of Planck Time.

Planck length is a number, not a limit.QuotePlanck length has no significant meaning, physically......................... It is just a length which light travels in one unit of Planck Time.

What happens for a moving photon after Planck time ?

Let's say Planck time is "t" = 1 second, if you measure after this 1 second for a moving photon you will consider time as zero seconds at this point and you will need to start from zero and measure Planck time again. If Planck time is 1 second you cannot say the photon elapses 1.5 seconds because if you start measuring at 1 second you start measuring from zero, time cannot elapse 0.5 seconds because the smallest time elapse is Planck time 1 second. A photon elapses 1 second and at this point it starts again from zero t=0 and elapse another one second you start measuring from this 2 seconds "t=0" to measure 3 seconds, 4 units,5 units,....This exactly shows that a photon moves at discrete motion " units" and length is limited to some minimum value.

the smallest length and the smallest time must exist

Quote from: Yahya A.Sharifthe smallest length and the smallest time must existThis is not a new argument. Several ancient Greek philosophers (the best-known being Zeno) produced arguments prior to 400BC, for or against continuous motion.https://en.wikipedia.org/wiki/Zeno%27s_paradoxes

Quote from: alancalverd on 29/09/2022 10:49:57Planck length is a number, not a limit.QuotePlanck length has no significant meaning, physically......................... It is just a length which light travels in one unit of Planck Time.Thanks, that's why I wasn't getting anything, how obvious!

If something is moving at half the speed of light, then it will move half a Planck length in one Planck time.

It does not need to move in Planck time

Planck time is just the smallest time that is possible.

The jump will be the constant discrete unit which is Planck length

Did you read the article above? This article shows the smallest length that is possible which is Planck length.

It may yet be the case that a quantum theory of gravity will reveal properties of our Universe beyond these limits...

So if something is moving at half the speed of light, how far will it have moved after the passage of 1 Planck time?

Quote from: Yahya A.Sharif on 30/09/2022 18:51:11Planck time is just the smallest time that is possible.We don't know that.

Quote from: Yahya A.Sharif on 30/09/2022 18:51:11Did you read the article above? This article shows the smallest length that is possible which is Planck length.That seems to be exactly the kind of "popsci" article that Colin2B was referring to.

Anyway, that article admits that smaller scales could exist:It may yet be the case that a quantum theory of gravity will reveal properties of our Universe beyond these limits...

before Planck time? It will not move