Purple Biosignatures: Reflectance Spectra of Non-Chlorophyll Bacteria and Implications for Exoplanet Life
To the point
Researchers test purple bacteria that power photosynthesis without chlorophyll by analyzing how they reflect light to search for surface biosignatures on exoplanets, noting their pigments can look brown or reddish and could be informative on cooler, infrared-rich worlds around red stars.
