衛星
えいせい · eisei · JLPT N3 · noun
satellite
🛰️ 衛星 = guard + star: a star that stands guard around a planet
衛 (ei) means guard or protect, as in 護衛 escort, and 星 (sei) means star. A satellite was first a moon circling its planet like a bodyguard. Both readings rhyme too: ei-sei.