Photo: European Space Agency
Scientists have discovered a विशाल ring-like geological structure on Mars that resembles the residue left in a bathtub after water is drained. According to researchers, it could be evidence of an ancient ocean that once covered about one-third of the planet’s surface, Space.com reports.
What scientists found
Previous research has confirmed that liquid water once existed on Mars, but it remained unclear whether it was limited to rivers and lakes or if a vast ocean also existed.
Earlier studies identified many features resembling ancient shorelines. However, these “shorelines” are located at different elevations across the planet. If they truly marked a stable ocean, they would ideally lie at roughly the same level—similar to sea level on Earth.
New approach
In the new study, scientists searched for alternative geological indicators of past oceans. They used computer modeling to simulate what Earth would look like if its oceans were drained.
They found that one of the most characteristic features of Earth’s oceans—besides water—is the presence of wide, flat coastal plains and continental shelves. These formations:
- can stretch hundreds of kilometers
- lie roughly 15–410 meters below sea level
- form ring-like patterns along the boundary between land and ocean
This creates a shape similar to a “bathtub ring.”
Evidence on Mars
Analyzing topographic data collected by orbiters, researchers identified a vast flat المنطقة in the northern hemisphere of Mars consistent with a continental shelf.
- Estimated depth: 1,800 to 3,800 meters below “sea level”
- Coverage: up to one-third of the planet
Such a large coastal shelf would require long-term stability and cannot be formed by lakes alone. This suggests the ocean may have existed for millions of years.
Why it matters
If confirmed, this finding strengthens the case that Mars once had:
- a stable, long-lived ocean
- a significantly warmer and wetter climate
- conditions potentially suitable for life
Additional context
Data from the Perseverance rover has also revealed unusual mineral formations, including crystals resembling rubies and possibly sapphires, further supporting the idea of a complex geological and chemical history on Mars.
