Lizazi zesayensi yezinkanyezi emhlabeni wonke ziskena indawo yePlanethi X, leyo planethi enkulukazi esesimisweni sonozungezilanga esinqunywa ngokubala imiphumela yayo yamandla adonsela phansi. Lena iplanethi ye-12, eyamenyezelwa ngo-1976 nguZacharia Sitchin. Kule ncwadi, uSitchin uthuthukisa umbono wakhe wokuthi impucuko yasendulo engaziwa yavakashela Umhlaba ezinkulungwaneni zeminyaka edlule. Ngokusho kwakhe, lawa ma-extraterrestrials, awabiza ngokuthi "i-Annunaki", azovela eplanethi engaziwa etholakala ohlelweni lwethu sonozungezilanga, aluchaza ngokuthi "iplanethi yeshumi nambili". Le planethi ingaba nomjikelezo ongavamile, oyi-elliptical obungawenza usondele eMhlabeni njalo eminyakeni eyizinkulungwane ezimbalwa.