So Can Flash Actually Run Faster Than the Speed of Light?

It’s finally out, the Snyder cut of Justice League. So, what about that part with Flash? This is not a spoiler, since Flash does this in other situations: He needs to run faster than the speed of light in order to go back in time to warn the Justice League about something.

Of course there are lots of physics questions to be answered, so let’s get right to it.

What’s So Special About the Speed of Light?

It’s easy to understand that velocity is relative. If you were walking at 1 m/s inside a train that is moving at 10 m/s, then someone on the stationary ground would see you moving with a velocity between 9 and 11 m/s (depending on which way you were walking). But our ideas about relative velocities are based on our own experiences with…

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