Scientists present more evidence for the oldest known fossils on Earth, which could bolster the search for alien life.
An ocean expedition near the Baja Peninsula revealed a strange, never-before-seen seascape teeming with life.
Anna-Louise Reysenbach is searching the sea floor for clues about life on Earth and beyond.
The discovery of these new species may thwart deep-sea mining efforts in the area.
Meet LUCA, the shared relative of you and me and everything else.