形容词
中文翻译：星际的
同义词：
['extraterrestrial', 'extragalactic', 'interstellar']
例句：
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1. The team's mission was to explore the unknown interplanetary space.
该团队的任务是探索未知的星际空间。
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2. The discovery of this celestial body is a milestone in our understanding of the universe.
这一天体发现是我们理解宇宙的一个里程碑。
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3. Interplanetary travel has become increasingly popular as space tourism becomes more accessible.
随着太空旅游变得更加可及，星际旅行变得越来越受欢迎。