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To give another example:

If you have a laser pointer and flick your wrist fast enough, the spot on the ground that your cat chases can move faster than light without violating any laws of physics.

That's perhaps easier to see, if you think of a giant laserpointer aimed at the moon.

Similarly, a shadow on the wall can move faster than the speed of light.




Wouldn't there be a delay between the time you flicked your wrist and the time the spot actually aligns, due to the limited speed of light?


Yeah, and observing this is a good way to see that information isn't actually being transferred faster than light.


Yep, definitely.

An outside observer that just sees the spot on the moon (but has no clue that it's produced by you flicking your wrists), just sees a spot that moves insanely fast.

No information, energy nor matter travels faster than light here, of course.




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