微び惑わく星せいびわくせいMeanings1nounplanetesimalastronomyTechnical term in astronomy for a small body that accretes to form planets.微び惑わく星せいは原げん始し惑わく星せい系けい円えん盤ばんの中なかで衝しょう突とつ合がっ体たいを繰くり返かえし、惑わく星せいへと成せい長ちょうする。Planetesimals repeatedly collide and merge in the protoplanetary disk, growing into planets.
