A pair of studies suggest that Mars lost its ancient water through two processes, retreating underground and escaping into space over billions of years.
Data from the InSight seismometer indicated a water-rich subsurface on Mars, suggesting that there is enough water to cover the planet in an ocean about a mile deep.
Observations by the Hubble Space Telescope and MAVEN orbiter focused on the escape of hydrogen atoms from the Martian atmosphere, adding clarity to water's fate.
The dual findings from different missions indicate that Mars once had a much more robust atmosphere and significantly more water, which has since diminished.
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