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檔案大小：2.1 MB
版本需求：需要 iOS 10.0 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Where’s the edge of space? What seems like a simple question has an answer with more layers than the Earth’s atmosphere. You might expect that space begins where the atmosphere ends, and that could be true. But, as it turns out, no one can tell exactly where that point is. And the majority of scientists look much closer to home, placing the edge of space well within the bounds of the atmosphere.
支援平台：iPhone, iPad