The reason I say “fun” post is it’s very unlikely a Nemesis star does exist, as we have been able to figure out masses and orbits in the solar system with a high degree of accuracy for quite some time. Meaning if an object this massive was this close — Nemesis is thought to be a red dwarf star or brown dwarf — we’d have to account for it in the astronomy.
In any event, I do expect Nibiru devotees to disagree with this opinion, or if/when WISE doesn’t find it.
Charlie’s post refers to an article in Astrobiology Magazine, which is sponsored by NASA. Check out what they have to say, Leslie Mullen writes:
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Is our Sun part of a binary star system? An unseen companion star, nicknamed “Nemesis,” may be sending comets towards Earth.