Part 8/10:
Science suggests that Mars once possessed a stronger magnetic field, which safeguarded its atmosphere. Evidence from orbiters indicates that about 4 billion years ago, Mars lost much of its magnetosphere, exposing its atmosphere to erosion by solar winds. The removal of atmospheric particles into space has contributed to its current cold and thin environment.
In certain regions, signs of past water activity are evident. Impact craters and surface patterns, such as trails of flowing water and melting ice, suggest that liquid water once existed or may still be present underground.