In another paper led by Michalski and published recently, the scientists point out that the prospects for surface life on Mars might be dim, but the possibilities for subsurface life are promising. (technologyalpha.net)
They found a category of molecules that didn't look like petrogenic carbon or organic molecules derived from surface life like plants. (sciencemag.org)
Subterranean urban centers of the future could integrate natural light and flowing water to simulate surface living, as in this artist's rendering. (discovermagazine.com)