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It takes that long for the light depicting the event, to get here. If a star is 1,000 light-years away, that means it will take 1,000 years for the light depicting the event to get here. In other words, we see it as it was 1,000 years ago.

Light dosent travel to us that quickly and it's so far away that the light takes so many years or so to arrive here for us to see.

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