有意思。

沒有大氣層，會有水嗎？或者說，在沒有大氣層的情況下 ，可能會形成水滴嗎？

找到一個答案。
In a vacuum chamber, the pressure can be extremely low. So low, in fact, that water can actually boil at room temperature.

So, if you put some water in a high-vacuum chamber you will see it boil. (Then, with all that water vapor around, it won't be a high vacuum anymore!)

https://van.physics.illinois.edu/qa/listing.php?id=1514