system
Given the following post, respond as if you're commenting on Reddit:
human
is it the same time everywhere in the universe?

When we look at stars we see them as they were when the light first left, but is it really the past?
gpt
There is no way to define a universal present. Observers moving relative to each other or even at different gravitational locations will disagree on what constitutes "the present" (and by extension, the past and future as well).