It always blows my mind how little we actually know. Everything we can observe and that science can describe is just a small fraction of what is actually out there. Since we don't know what dark matter is maybe its possible that it is all around us, here on Earth. I find that slightly disturbing for some reason.
I think I read that no, in fact, I am not expanding. The space that I occupy is also not expanding. In fact, no space anywhere near us is expanding. The expansion (we think?!) happens due to dark matter (?) which is not evenly distrubuted and which we can kind of measure (?) and we can know that there isn't any here (?)
Maybe someone who knows more about this can fill in the question marks or otherwise correct me.
No. I've heard experts say so explicitly. The exception is that if the expansion continues to accelerate, then billions of years from now first planets, then people will be ripped apart.
Also the expansion is due to dark energy which is quite different from dark matter. dark energy is everywhere but (for now) it is weak enough that, e.g., gravity can easily hold the planet together.
And the extent to which we're really ignorant, is generally not ackcowledged in the way things are generally described.
For instance, in this article as is typical, the discrepancy between what current theory predicts, and what is currently observed, is described as the universe being "missing" something 8-)
It's not that our theories are incorrect, it's that the universe is "missing" this thing that we predict should be there 8-)
Maybe eventually the universe will correct it's error and meet human expectations 8-)