A new study that compares the current Martian atmosphere revealed by the instruments of the Curiosity rover to the early atmosphere samples found trapped within Martian meteorites found on Earth finds that Mars lost most of its atmosphere very early on, possibly as much as four billion years ago.
Exactly how that meshes with the "warmer, wetter" early Mars theory is unclear. Perhaps Mars was a dying world even as conditions conducive to life were developing,
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