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This question already has an answer here:

In theory can entities in future spacetime look "back in time" to us, as we look back in time to other entities light years away, or is time simply a function of the distance and distance determines the relative time of all entities in relation to one another?

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marked as duplicate by John Rennie spacetime Apr 6 at 10:58

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An entity that is 100 light-years away from us sees us as we were 100 years prior, and we see them as they were 100 years earlier as well. It is simply a matter of the finite speed of light, and the distance between the observer and the observed.

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  • $\begingroup$ Should it be noted that this isn't a consequence of special relativity? $\endgroup$ – Aaron Stevens Apr 5 at 21:32
  • $\begingroup$ Perhaps. But the OP didn't make the explicit connection so neither did I. $\endgroup$ – niels nielsen Apr 6 at 5:10

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