微行星 meaning in English
planetesimal
Examples
- Models of the solar system ' s early history posit that the frequency of impacts should have tapered off between 4 . 5 billion and four billion years ago because most of the planetesimals ? the small rocky bodies that formed from the solar nebula ? were gradually cast out of the inner solar system or absorbed by the outer planets
描述太阳系早期历史的模式假设，撞击频率应该在45 ~ 40亿年前趋缓，因为大部份的微行星（由太阳星云形成的小型石质天体）逐渐被驱逐出内太阳系或被外行星吸收。