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But more than these kinds of natural processes are needed to have an atmosphere. You also need gravity. Without sufficient gravity, any gases will just leak out into space and be gone. Earth loses some of its atmosphere this way, but in general it has enough mass to hold on. The moon, on the other hand, with only one-sixth the gravitational pull of earth, isn't big enough to do the job. Still, recent observations have shown that the moon does in fact have an atmosphere of its own. It's so thin, however, that it only counts as one in technical terms, and certainly couldn't be breathed. So much for that restaurant.
除了這些自然進程產生氧氣外。您還需要重力。沒有足夠的引力，任何氣體都會泄漏到太空，并消失。地球也這樣失去了一些大氣，但總體來說地球吸引住足夠多的大氣。月球，從另一方面說，它只有地球的六分之一的引力，無法完成這樣的工作。盡管如此，最近的觀測表明，月球確實有其自身的大氣層。但它是如此之薄，它只能作為一個技術術語計數，而不能被互信。談到月球上的餐廳就說這么多。
