Why is Mars barren and uninhabitable, while life has always thrived here on our relatively similar planet Earth?



Summary

Mars’ barrenness compared to Earth’s vibrant life stems from a crucial difference: water retention. While Mars likely possessed liquid water early in its history, it lost its global magnetic field, exposing its atmosphere to solar winds. These winds stripped away the atmosphere and, consequently, the water, leaving the surface cold and dry. Earth, protected by its magnetic field and active volcanism replenishing the atmosphere, retained its water and a habitable environment. The presence of liquid water is fundamental for life as we know it, making it the key factor differentiating the two planets’ destinies.

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