3 ms·

Water vapor is lost to the vacuum of space, though it's obviously not enough to make a perceptible difference, at least on a human scale.

• JoeAltmaier 11y ago
  ...and replenished from space through slushball comets!
  • snuxoll 11y ago
    (Almost?) All water on Earth came from a comet, pretty amazing when you think about it.
    • codeisawesome 11y ago
      Extremely. I just can't reconcile the fact that all this water came from multiple comet impacts. It somehow feels wrong.
      • JoeAltmaier 11y ago
        ...and if even one of the trillion comets over a billion years had some spore or cell frozen inside...