Space isn't empty, it's full of stuff, every inch is full. If it were nothingness, then nothing could be in space. But no matter where you go in known space, there is something. It's like if I scribble with a pincel in the air, then scribble the pincel on a sheet of paper, which will show a mark? Space is like that paper, it's marked with particles. Even more than that, but the very fabric of time.
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