Eli5: Why is light that fastest possible thing?

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If we know the exact speed of light then it’s clearly not infinite. If that’s the cause, what is preventing us from sending something faster then the speed of light( ignoring our current technology limitations).

In: Physics

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Anonymous 0 Comments

So…it has nothing to do with technological limitations. But before we get there, it’s not just the speed of light. The speed of any massless particle (including photons) in vacuum is a universal constant. It just is how our universe behaves. The physics that explains the relationship basically links space and time was demonstrated by Einstein, and it basically shows that photons (and other particles moving at “c” ) do not have time. Imagine a movement in a 4 dimensional spacetime – three spatial and one dimension of time. If you move slow, you cover a little bit of distance in a lot of time (that’s what “slow” means after all). If you move fast, you cover a lot of distance in very little time. The faster you move, the more distance you cover > and less time. If you move really really fast, you cover very little time….until you hit zero time. Once you hit zero time, you are moving at maximum speed (since time only flows one way, there’s no negative time we have observed). So if there’s a limit on time you can cover (in this case 0), there’s a limit on distance you can cover. That speed turns out to be ~300km/s and is known as “the speed of light”.

It has nothing to do with technology.

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