Ancient Mars was ripe for underground life

Conditions beneath the surface on ancient Mars were ripe for life, according to a new study.
Scientists now believe that there was enough chemical energy beneath the surface on the planet for microbes to thrive.
"We showed, based on basic physics and chemistry calculations, that the ancient Martian subsurface likely had enough dissolved hydrogen to power a global subsurface biosphere," said Jesse Tarnas, lead author of the study.Mr Tarnas, a graduate student at Brown University, added: "Conditions in this habitable zone would have been similar to places on Earth where underground life exists."The work, published in the journal Earth and Planetary Science Letters, refers to subsurface lithotrophic microbial ecosystems - also known as SliMEs.These ecosystems allow microbes beneath the surface to receive their energy without sunlight, but by peeling electrons from molecules in their environments.
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