Why does it have to be so obscure? Why planets, moons, etc? It doesn't serve any purpose other than confusing anyone not familiar with it and making those familiar with it seem like the "all knowing" in group.
Moons are the /0 subdomain you get with a /32 aka planet, and comets are the 64 bits of free address space left over in the 128 bits of address width. To create a comet, you make a public-private keypair where the public key hash doesn't collide with owned address space. If you miss, you spin up another keypair and keep going until you get one.
That's really the whole thing. These things need names, as evidence, I present the fact that in IPv4, they have names. To my taste "slash eight" is more obscure than "galaxy", your mileage may vary.
