The European Space Agency’s ExoMars Trace Gas Orbiter (TGO) has captured stunning images of a salty, purple wave on Mars’ surface, dubbed the “purple mermaid.” This natural anomaly is located in Terra Sirenum, a region known for its dried-up riverbeds. The “mermaid” is actually chloride salt deposits, detected by TGO’s Color and Stereo Surface Imaging System (CaSSIS).
The CaSSIS camera uses stereo imaging to create detailed 3D models of Mars’ surface features. This technology allows scientists to study the Red Planet’s topography and geological processes from afar. The purple hue is caused by chlorine-rich minerals, which are a signature of water that once flowed on Mars.
Due to Mars’ lack of a magnetic field, its atmosphere eroded away, taking most of its water with it. However, mineral deposits like this “purple mermaid” remain as fingerprints of the planet’s former presence. These salt deposits could provide evidence for the existence of former Martian life and serve as a starting point for future surface explorers searching for signs of life.
The ESA team notes that very salty waters could have been habitable places on Mars, allowing life to thrive. The high concentrations of salt allow water to remain liquid at temperatures as low as -40°C, making areas like Terra Sirenum attractive targets for future robotic missions seeking signs of life.
Source: https://www.space.com/mars-esa-exomars-sea-of-the-sirens