流浪行星在星系中游走这个概念并没有它听起来那么难以捉摸，与其他星球或流星的引力之战很有可能使该星球脱离太阳系。
The idea of rogue planets wandering the galaxy is not as far-fetched as it may sound. Gravitational tugs-of-war with other planets or passing stars can boot a planet out of its solar system.
因为流星从不结合在一起而形成较大的行星，很多它们的组成部分都是形成于太阳系的最初阶段。
Because asteroids never got it together to form a larger planet, a lot of what they are made of was formed in the solar system's earliest days.
塔特尔彗星在太阳系里飞奔时，留下了一路碎片，漂浮在一片区域中，当地球运转进入这片区域时，仙英座流星雨就爆发了。
The Perseids occur when Earth runs into pieces of debris floating in the solar system that were left behind by Comet Swift-Tuttle.
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