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Water on Mars? Scientists discover 'bathtub ring' which may reveal contours of ancient ocean

From Jerusalem Post · (5h ago) English

Summarized and contextualized by DistantNews.

TLDR

  • Scientists have identified a feature on Mars resembling a "bathtub ring," potentially indicating the shoreline of an ancient ocean.
  • This discovery, based on data from a NASA probe, suggests Mars may have once hosted a large, long-lived ocean on its northern plains.
  • The findings offer new insights into Mars's warmer, wetter past and the processes that led to its current arid state.

The quest to understand Mars's watery past has taken a significant leap forward with the identification of what scientists are calling a "bathtub ring" on the Red Planet. This feature, detected using data from NASA's Mars Global Surveyor probe, may represent the ancient shoreline of a vast ocean that once covered the planet's northern plains. This discovery, published in the journal Nature, provides compelling evidence for a once-habitable Mars, a stark contrast to the cold, arid world we observe today.

The Martian ocean could have existed when the planet had an active hydrological cycle, with flowing rivers and lakes, nearly 3.7 billion years ago, and it likely disappeared as the planet became dry. Exactly where the water went remains highly debated.

— Abdallah ZakiExplaining the potential timeline and conditions of a Martian ocean.

Researchers liken the feature to a "bathtub ring" because it outlines where water may have met land on Mars, much like the residue left after a bathtub drains. Unlike Earth, Mars lacks continents and plate tectonics, so scientists are referring to these Martian landforms as a "coastal shelf." This shelf could have formed over millions of years as rivers deposited sediment into the ocean, and wave action shaped the coastline. The presence of such a feature suggests a dynamic hydrological cycle on early Mars, approximately 3.7 billion years ago.

A 'bathtub ring' on Mars means that if an ocean filled the northern lowlands, it may have left behind a shoreline, or shelf-like boundary, marking the water level.

— Abdallah ZakiDefining the significance of the 'bathtub ring' discovery.

Lead author Abdallah Zaki, a planetary scientist at the University of Texas, explained that if a rover were to explore this area, it would likely find sedimentary rocks and structures analogous to Earth's continental shelves. This includes layering, sloping surfaces known as clinoforms, and textures created by wave and current activity. While the existence of a Martian ocean has been debated, this "bathtub ring" offers a tangible marker, helping to define the boundaries of that ancient body of water and fueling further research into where that water ultimately disappeared.

If we sent a rover, we would expect to see sedimentary rocks and structures similar to those found on Earth's continental shelves, including layering, sloping surfaces called clinoforms, and textures produced by waves and currents.

— Abdallah ZakiDescribing what future exploration might reveal at the site.
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Originally published by Jerusalem Post. Summarized and contextualized by our editorial team with added local perspective. Read our editorial standards.

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