Solved cryptogram
The air on Mars is so thin that liquid water at the surface would boil away rather than pool.
Astronomy Facts, sourced to NASA.
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What it means
Boiling happens when the pressure pushing down on a liquid drops below its vapor pressure, and on Mars the atmosphere is under a hundredth of Earth's. Water there tends to go straight from ice to vapor without a liquid stage. That does not mean Mars is dry. There is a great deal of ice at the poles and under the surface, and the landscape is carved with channels cut by water long ago.
The claim comes from NASA.
- SourceNASA
- CollectionAstronomy Facts
- Difficultyhard
- Length74 letters, 20 unique
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