The naming schema actually tripped me up for a week or so.

My brain's initial conception of the concepts was earth-relative, so I mapped it as:

Sol = big, it's the sun Luna = medium, in-between sun and earth, space Terra = small, terrestrial

Pretty weird when the moon is as much between earth and sun as the earth is between the moon and the sun.

It tripped me up because I was going by distance. I thought Terra was the base model and Luna was the mid model because it’s further away.