I think you’ve started to answer your own question: what we think of as “nothing” is actually something that’s turned out to be pretty complicated.
Our observations lead us to conclude that reality behaves as though we can assign a degree of “bend” to every point in space relative to us, even if a lot of space happens to have zero bend to it.
Maybe think of space being like sheet music: even when there’s nothing being played in a song, there’s still notation for how many beats of rest are in the song at that point. The silence isn’t empty *nothingness,* exactly, because each silence has its own specific qualities like duration.
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