New Study Challenges Water Theory Behind Mysterious Martian Slopes
May 20, 2025 — Space & Science News
A new study has shed light on the mysterious dark streaks that have appeared seasonally on Mars’ slopes, challenging the long-standing belief that flowing water was responsible.
Known as Recurring Slope Lineae (RSL), these dark streaks have intrigued scientists since they were first observed over a decade ago. Previously believed to be caused by briny liquid water flows, the latest findings suggest a dry, granular flow as the most likely explanation.
Researchers from the U.S. Geological Survey and several international institutions analyzed high-resolution images captured by NASA’s Mars Reconnaissance Orbiter. Their results indicate that the streaks form under conditions where water is unlikely to be present, particularly at high temperatures and low humidity levels.
Lead author Dr. Colin Dundas stated, “We’re seeing patterns that are more consistent with dry material moving downhill, similar to how sand behaves on Earth.”
This discovery not only reshapes theories about Martian surface activity but also has implications for the planet’s potential habitability, as the presence of liquid water is a key factor in assessing life-supporting conditions.
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