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THE first lifeforms on Mars may have been the architects of their own downfall.According to research, ancient Mars may have had an environment capable

Ancient Mars may have had an environment capable of harboring an underground world teeming with microscopic organisms, French scientists reported Monday. But if they existed, these simple life forms would have altered the atmosphere so profoundly that they triggered a Martian Ice Age and snuffed themselves out, the researchers concluded. The findings provide a bleak…

French scientists reported ancient Mars may have had an environment capable of harboring an underground world teeming with microscopic organisms.

CAPE CANAVERAL, Fla. -- Ancient Mars may have had an environment capable of harboring an underground world teeming with microscopic organisms, French scientists reported Monday.

The findings conclude that life — even simple microbes — might cause its own demise

Ancient Mars may have had an environment capable of harboring an underground world teeming with microscopic organisms

CAPE CANAVERAL, Fla. -- Ancient Mars may have had an environment capable of harboring an underground world teeming with microscopic organisms, French scientists reported Monday.

Ancient Mars may have had an environment capable of harboring an underground world teeming with microscopic organisms.

Hydrogen-hungry microbes may have saturated the Martian atmosphere with methane, triggering a terrible ice age.

Scientists used climate and terrain models to evaluate the habitability of the Martian crust some four billion years ago.