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Imagine a photon coming from the Andromeda Galaxy 2.5 million light years away and hitting your...

Imagine a photon coming from the Andromeda Galaxy 2.5 million light years away and hitting your eyeball (fun fact: the Andromeda Galaxy is the farthest object that a human can see with unaided eyes!). How much time does the photon experience during its trip? Explain.                                   

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