以上来源于: WordNet
Earth is a target in a cosmic shooting gallery, subject to random violent events that were unsuspected a few decades ago.
地球是“宇宙射击场”中的一个靶子,容易随机遭遇各种猛烈的撞击事件,这在数十年前从未受到过怀疑。
One calls for launching microsatellites into low Earth orbit in constellations that would provide continuous target coverage.
其中之一是将小卫星发射到低地球轨道构成卫星星座,以便能提供对目标的持续覆盖。
Given realistic propulsion options, and the requirement that the spacecraft can slow down to orbit its target, the target star cannot be more than 15 light-years from Earth.
根据实际的推进选择,以及航天器能够减速以环绕其目标公转的需要,目标恒星不能离地球超过15光年。
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