nebular hypothesis

nebular-hypothesis的词性：
n.（名词）

1. A theory of the origin of the solar system according to which a rotating nebula cooled and contracted, throwing off rings of matter that contracted into the planets and their moons, while the great mass of the condensing nebula became the sun.
星云假说：太阳系统起源的学说，一个转动的星云冷却后收缩，脱离出许多圈的物体，这些物体收缩成行星及其卫星，而最大的收缩星云方形成的天体成为太阳