counterearth / ˈkaʊn tərˌɜrθ /

⚽高中词汇反地反地盘反地球反土

counterearth 的定义

n. 名词 noun
  1. a planet, out of sight from our part of the earth, whose shadow upon the sun and moon, cast by a central fire that is also out of sight, causes the eclipses.