It used nitrate or perchlorate in place of oxygen, according to a paper published online November 5, 2026, in Applied and Environmental Microbiology (doi:10.1128/aem.01749-26).
It shows almost 63,000 radio sources, among them active galactic nuclei and star-forming galaxies, across an area about 25 times that of the full moon.
A positive test result can raise our assessment of the probability of a disease without settling the diagnosis. Two results that agree can add less information than we expect. Bayesian reasoning shows how to weigh new evidence in diagnosis, in science, and when reading the news.