Mystery Atlas
Scientific Concept

Recurring Slope Lineae

Dark streaks that periodically lengthen and fade on Martian slopes; a 2015 study linked them to seasonal briny water flows, but 2017 topographical analysis found their steep angles better match dry granular sand flows, leaving the mechanism disputed.

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Theories & Explanations

  • Mars Subglacial Lake Claim

    Recurring Slope Lineae is frequently compared to Mars Subglacial Lake Claim — Both are cases where an initial liquid-water interpretation was challenged by a competing mineral or dry-process explanation.

Science & Technology

  • Water on Mars

    Recurring Slope Lineae is an instance of Water on Mars.

Explored on these pages

Is There Water on Mars, and Could It Support Life?

Is there water on Mars? Ancient lakebeds, hematite 'blueberries', a disputed subglacial lake, and the seasonal streaks scientists still argue over.