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Would it not be better if the article was structured in chronological order of when these proposals emerged? So: Central Fire (BC), Smith (1830s), Lilith (1918), Hubbard (1950s), Ummo (1960s), Sitchin (1970s), Serpo (1980s?), Rizq (1990s?). Ghmyrtle (talk) 09:29, 23 February 2012 (UTC)
Chronological or alphabetical, both are fine to me. Serendipodous 18:06, 23 February 2012 (UTC)
Someone needs to add a section about Nibiru to this article as it is one of the more talked about crackpot pseudoplanets — Preceding unsigned comment added by 220.127.116.11 (talk) 04:05, 10 November 2012 (UTC)
It is discussed, under "Planets proposed by Zecharia Sitchin". Serendipodous 08:09, 10 November 2012 (UTC)