I think you want me to say a black hole, but that is a very different thing than "nothing". My answer would be that there is empty space there seemingly, you could not see whatever it is. A black hole is the furthest thing from nothingness, it is the most dense thing we know of in physics, it has more matter than anything else in a given area.
Originally Posted by RedDog
In my understanding of it, when you are looking at a point in 3d space, and you cannot see a receding galaxy, it would mean that the particles coming from that galaxy are too far away and traveling away from us too fast for us to detect.
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