   天体地质学astrogeology
 太阳星云solar nebula
 吸积accretion
星子planetesimals
 陨星meteorite
 火流星fireball
 月海maria
 环形山craters
 中央峰central peak
 月谷rilles
 直壁walls
  质量密集mascons
  月球浮土regolitn Iunar
 角砾岩breccia
  斜长岩anorthosite
  月震moonquakes
 俘获假说capture hypothesis
 分裂假说fission hypothesis