If Google was going to go with elements, it should have been an absolute no-brainer to link size of of the element to the size of the model eg. Hydrogen/carbon/argon, but no, Google screws up the naming like they _always_ do. Hell, use the noble gases for christ sake. Helium/neon/argon/krypton/xeon would have been great, not perfect mind you, because a lot of people might not remember the ordering of those elements, but at least it would be consistent and make sense.
Letters of the alphabet: Also makes no sense. There was a theory that Argon = A, that there was an unreleased B model (Bismuth or Barium or something), Carbon = C, etc. (Similar to Intel's MMORPG-inspired Alchemist --> Battlemage --> Celestial...) Hydrogen broke this notion.
It's just completely incoherent.
Also, the biggest being Astra is a bit confusing. Sol is also a star.
Furthermore, unless you know they’re supposed to be ordered by size you can’t know which is best.
I don't think these are as difficult as you're making them sound? I think the majority of people who will care what model they're using will know "lunar", "terrestrial", "solar", "astronomy" etc?
Ar - C - H - ?
Hydrogen: this thing floats. Density less than air.
Argon: does not float. Density more than air.
Carbon: this thing is a solid, whichever allotrope you pick. It’s solidly heavier.
See, so easy! /s