Full disclosure: I’m high, but what exactly is expanding in the universe? Like I read something at some point that said that galaxies and cosmological bodies aren’t actually moving away from us faster than light, the space between them is just expanding. They made a distinction somehow but now, a long time after reading that, I’m sitting here wondering what it is that’s expanding… and wouldn’t whatever it is be expanding faster than light? I hope someone can help because I’m starting to spiral out.
In: Physics
> wouldn’t whatever it is be expanding faster than light?
Yes. The *cumulative* effect of expansion over long distances makes galaxies drift apart faster than light. You can’t move through space faster than light, but the galaxies themselves aren’t moving…*space itself* is expanding.
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