What specific features, identified by the HiRISE camera, indicate intermittent liquid flow on present-day Martian slopes?
Answer
Recurring Slope Lineae (RSL)
Recurring Slope Lineae (RSL) are dark, narrow streaks observed on steep slopes that darken and flow downhill during warmer Martian periods, fading in winter, providing evidence of modern, albeit intermittent, flow.
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