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MysteryMystery305 OP t1_j1151vw wrote

Reply to comment by heavy_metal in How would we get about traveling through deep space? by MysteryMystery305

Alpha Centauri is 4 light-years away, right? And a light year is how long it takes light to travel one year. So traveling at the speed of light, it would take 4 years.

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heavy_metal t1_j11857l wrote

from the perspective of a photon, it is instantaneous. from a observer's "planetary" frame, it takes 4 years. when you are in a ship going fast, time it takes to get where you going shrinks. special relativity :)

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