They botched it.
A haiku is a short poem. A sonnet is a longer work. An opus is a great work. Mythos is a connected body of works.
As with Open AI, Luna --> Terra --> Sol --> Astra from smallest to largest. Very straightforward.
With Google it's totally incoherent. Hydrogen --> Argon --> Carbon!?
Hydrogen is small, but it's the most abundant element in the universe by far. Argon is >3x larger than carbon by molecular mass, though carbon is more abundant. It's impossible to determine what's supposed to be smaller and what's supposed to be larger.