词根词缀：plano-, plan-, -plany, -plania

【来源及含义】Greek: passively drifting, wandering, or roaming; planet or planets

【相关描述】The planets are shown in this unit with images and links for details about each planet.

【相关词根词缀】 A cross reference of word units that are related, directly or indirectly, to the: "moon": Calendar, Moon Facts; Chemical Element: selenium; Gods and Goddesses; luna, luni-; Luna, the earth moon; menisc-; meno-; Planets in Motion; seleno-.

【同源单词】angioplany, aplanogamete, diplanetism, exoplanet, extrasolar planet, interplanetary

词根词缀：sphero-, spher-, -sphere-

【来源及含义】Greek: ball, round, around; globe, global; body of globular form; by extension, circular zone, circular area

【相关词根词缀】 Related ball, sphere-word units: glob-, glom-; hemoglobin-.

【同源单词】adminisphere, aerosphere, allobiosphere, anthroposphere, asphere, aspheric