China's Mars rover Zhurong has provided key observational evidence of liquid water at low Martian latitudes, the warmest regions on the red planet, according to a new study published in the journal Science Advances this week. Previous studies found evidence of a large amount of liquid water on early Mars, but dramatic climate changes led to very low pressure and water vapor content, making it difficult for liquid water to exist sustainably on the present-day planet. Scientists believe that water can now only exist there in solid or gaseous forms.

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