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.
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。
Moons are generally thought to form in one of two ways - either by coalescing from the same cloud of debris as their parent planet, or as wandering objects captured by the parent's gravitational pull.
卫星通常被认为形成于两种途径：一是由它们母星的同性云状碎片合并而成，一是被母星重力抓住的游离天体。
As the 21st century unfurls, people of every class and from every country will be wandering to every part of this planet.
随着21世纪的徐徐展开，来自各个阶层、各个国家的人们将漫游在这颗星球的每一角落。
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