Astra means stars.

The more obvious, to me, interpretation was distance from us so I would've expected Terra -> Luna -> Sol -> Astra.

When I think of space and astronomical scales, I think of distance as much more common concern.

i think you underestimate how much you "just getting it" stems from being terminally online - this is a HN model release thread after all

I don't doubt that you feel that way, and there's no way I can really provide you any evidence. But I wasn't trying to be obtuse.