微行星被认为是存在于原行星盘和残骸盘内的固态物体。
微机电系统(MEMS)是近年来兴起的一门新兴技术，微行星齿轮减速器是微机电系统中的重要器件。
Micro Electro Mechanical System (MEMS) is a course of new technology rising in recent years. Micro planetary gear reducer is the important part in MEMS.
这些微行星体（planetesimals）的增长会用到几百万年到2千万年的时间，而最外面的部分最晚形成。
The accretion of these "planetesimals" is believed to take a few hundred thousand to about twenty million years, with the outermost taking the longest to form.
第一个气态巨行星的另一个功效，是它的重力会把附近的微行星远远抛向系统外侧区域，让它们在该处形成新的世界。
Another effect of the first gas giant is that its gravity tends to fling nearby planetesimals to the outer reaches of the system, where they can form new planets.
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