Don't know about the leopard and model x, but at least in the case of OpenAI luna > Terra > Sol > Astra is a pretty obvious size progression.
But I come from a latin language background, so maybe I'm a bit biased there.
Good God, what has happened to people here? You literally wrote that Luna is greater than Terra, Terra is greater than Sol and so on.
At the risk of taking a geocentric position, my gut feel is Terra -> Luna -> Sol -> Astra. Sorting algorithm is distance from observer.
Size wise Astra is not categorically bigger than Sol, both in absolute terms and the observed size.