Biosignatures & Paleobiology: July 2019

Scientists have developed a new method for detecting traces of primordial life in ancient rock formations using potassium.

When Carl Sagan observed the Earth during a Gallileo fly-by in 1993, he found a widely distributed surface pigment with a sharp reflection edge in the red part of the spectrum, which, together with the abundance of gaseous oxygen and methane in extreme thermodynamic disequilibrium, were strongly suggestive of the presence of life on Earth.