Vianova writes:

"...perhaps there is something to historical mythology of a returning large planet ."

Could there be something big and dark quietly orbiting our sun far beyond the known Solar System?

Could be.

But I don't see a single shred of convincing 'historical mythology' that even suggests such a situation. If, however, one insists on adding brown dwarves to the Solar system planetary lexicon based on cherry-picked myths and questionable translations of the same, one should also include mermaids in biology texts, and fund an expedition to Faery to obtain samples of unicorn horns.

I submit that the evidence for either is *at least* as strong as that for 'Nibiru.'