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Is it possible to go at light speed if I take a photon as referencial?


goldenpeach

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Hi!

Let's say I take a lase and point it toward myself.

If I take one of the photons travelling toward me as referencial, can I say that my speed is equal to the speed of light(assuming that I am in a perfecr vacuum)?

The photon is travelling toward me at the speed of light so i seem correct(to me) to say something like that but I know it's impossible to travel at light speed.

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Light cone coordinates, while they have their use, should not be used as a frame of reference in general.

For example, say you are taking an aim at the target at the range using a laser sight. Then you fire. Now, relative to you, light from the laser is traveling at the speed of light. Relative to bullet, it also travels at the speed of light. So if it's fair to say that you are traveling at the speed of light with respect to the photon, same can be said about the bullet. So then you and the bullet travel at the same speed? But you fired the bullet. Clearly, it's moving with respect to you, so the speeds have to be different. See, it just falls apart like that.

Ultimately, it has to do with the fact that from perspective of light, there is no longer a distinction between space and time. For a photon, the only direction that exists is forward. It's both its direction and its future. And if you only have one dimension, and it is both a space and time, how are you going to go about defining velocity of anything?

So yeah, the short answer is that you simply can't use light as frame of reference like that.

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