The claim of underground liquid water near Mars’ south pole might not be so watertight after all.
But researchers have since proposed that those discoveries might not hold up to scrutiny. In 2021, one group suggested that
And now another team has shown that ordinary layers of rock and ice can produce many of the same radar signals previously attributed to water. Planetary scientist Dan Lalich of Cornell University and his colleagues calculated how flat layers of bedrock, water ice and carbon dioxide ice — all known to be plentiful on Mars — reflect radio waves. “It was a pretty simple analysis,” Lalich says.
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