This honestly blew my mind. The fact that a hypothetical sentient being billions of light-years away moving towards or further from Earth in the right way can actually see a “future” now-slice from our perspective raises all kinds of philosophical issues like the existence of free will (i.e., how can that being see our future before we have even made the decisions to create that future?) that I can’t wrap my head around. But from a scientific POV, I have started processing the notion that a higher-dimensional being might see time as just another spatial dimension and can move freely from the past to the future to the present like we move from left to right, up to down. If I think of humans as 3-D beings trapped in a 4-D or 5-D world, these paradoxes make more sense–if we are seeing the implications of a higher-dimensional universe from our 3-D perspective, we are bound to run into paradoxes and weirdness that doesn’t make sense to us.