The rover's radar detected what appears to be a subsurface layer of water ice beneath a layer of Martian soil. The discovery is significant as it suggests that water may exist in a liquid state on Mars.
Water may be more widespread and recent on Mars than previously thought, based on observations of Martian sand dunes by China's rover.
Before Zhurong fell silent, it observed salt-rich dunes with cracks and crusts, which researchers said likely were mixed with melting morning frost or snow as recently as a few hundred thousand years ago. "We think it could be a small amount ... no more than a film of water on the surface," co-author Xiaoguang Qin of the Institute of Geology and Geophysics said in an email.
They ruled out wind as a cause, as well as frost made of carbon dioxide, which makes up the bulk of Mars’ atmosphere.
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