Ice and snow are reflective making the planet more visible to the observer.
Our planet has frozen poles. Rivers and oceans may have been prominent features in its early history billions of years ago Mars was a warm and wet world that could have supported microbial life in some regions but the planet is smaller than earth with less gravity anything or atmosphere overtime as liquid water evaporated more of it escaped into space along less to fall back to the surface of the planet.
The Deep Freeze: Ice on Mars. Like Earth, Mars has ice caps at its poles. Water reaches the poles as vapor and is frozen into thin layers that build up thick deposits. Mixed with this water is dust picked up by the wind, so the caps have bright and dark layers of "clean" and "dirty" ice.
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