微型行星会慢慢互相碰撞而增加重量。
The "planetesimals" would slowly collide with each other and become more massive.
这现象一直持续，直到微粒达到巨石或者是微型小行星的大小。
This goes on until the particles get to the size of boulders or small asteroids.
中国的第一个行星探测器，“萤火虫1号”微型轨道飞行器，也将搭载在“火卫一步兵”上飞往火星。
China's first planetary probe, the tiny Yinghuo 1 orbiter, will also hitch a ride to Mars with Phobos-Grunt.
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