biosignatures

Artist's conceptual picture of phosphine in the atmosphere of Venus.

To confirm life on other planets, we need to detect far more molecules in their atmospheres than we currently do to rule out non-biological chemical processes.

Stromatolite rocks in shallow waters

As the Mars Rover sets out to look for evidence of life on another planet, scientists back on Earth suggest viruses played a key role in creating stromatolites, our planet’s earliest lifeforms.