微粒形成团块，团块之间相互碰撞，周而复始直到给定轨道上的所有物质集中成一个物体——行星。
Specks form into clumps, these collide with other clumps, and the process continues until all the matter in any given orbit is concentrated into one object—a planet.
微粒形成团块，团块之间相互碰撞，周而复始直到给定轨道上的所有物质集中成一个物体——行星。
Specks form into clumps, these collide with other clumps, and the process continues until all the matter in any given orbit is concentrated into one object—a planet.
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