Evidence is mounting that the same basic chemistry that made Earth habitable is unfolding, or once unfolded, on Mars. From complex organics to minerals linked with microbial activity, the Red Planet ...

For more than a century, the idea that life might have arrived on our planet from elsewhere in the cosmos sat at the fringes of science. Now a mix of genetic clues, asteroid samples and tough little ...

During Earth's ancient Snowball periods, when the entire planet was wrapped in ice, life may have endured in tiny meltwater ponds on the surface of equatorial glaciers. MIT researchers discovered that ...