Title pretty much covers the question.
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We’re seeing it as it was 10 years ago; that’s the amount of time it took for the light to get here.
You could think of it like, if the moon was 10 light years away, and we could see someone turning on a flashlight for 1 year, then off forever, it’d still take 10 years to get to us (when we’d see it).
To us we’d see that flashlight on for another year, that’s how long they kept it on. But to them, they turned off the flashlight 9 years ago.
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