Molecular assembly theory; a theory which helped Astro-biologists develop an index to search for life as we do, or do not, know it.
Link: https://astrobiology.nasa.gov/news/universal-life-detection-astrobiology-assembly-theory/

Astrobiology
Astrobiology 101: Life, the Universe, and How We Search for Our Cosmic Neighbours
Look up at the night sky and it is difficult not to wonder: are we alone? Astrobiology turns that ancient
