protoplanet

n. [天]原行星

词形变化

protoplanets 复数 protoplanets

释义与例句

n.
  1. 1.

    An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets

    原行星

词源

From proto- + planet.

来源：wiktionary