Are We Alone? Breakthrough Study Reveals New Way To Find Alien Life

NDTV

2 days ago

A team of scientists, led by astrophysicist Daniel Apai from the University of Arizona, has developed a novel framework to assess the habitability of exoplanets-planets orbiting stars beyond our solar system. Traditionally, the search for extraterrestrial life has focused on the presence of water. However, Apai's team introduces a more comprehensive model that considers various factors, including temperature and metabolic viability, to determine if known or hypothetical organisms could survive on distant worlds.
This new approach, detailed in their recent publication, emphasizes evaluating specific environmental conditions of exoplanets to assess their potential to support life. By moving beyond the simplistic criteria of water presence, the model aims to provide a more accurate assessment of a planet's habitability.
According to The Metro, Apai's work is part of the broader "Alien Earths" project, funded by NASA's Astrobiology Program. This interdisciplinary initiative seeks to identify and characterize potentially habitable planets around nearby stars, guiding future missions in the search for life beyond Earth.
He wrote in The Conversation. "Even on Earth, organisms require different conditions to survive - there are no camels in Antarctica. By talking about specific organisms, we made the question easier to answer."
"Second, the quantitative habitability framework does not insist on black-or-white answers. It compares computer models to calculate a probabilistic answer. Instead of assuming that liquid water is a key limiting factor, we compare our understanding of the conditions an organism requires (the "organism model") with our understanding of the conditions present in the environment (the "habitat model")."
Apai's team developed a model to assess habitability by evaluating an organism's needs beyond water. For example, camels require hot, dry climates, so the model correctly rates icy Antarctica as unsuitable. Testing the model on TRAPPIST-1e-like exoplanets, they assessed methanogens-ancient microbes-and found a 69% habitat suitability. This indicates such planets may support simple life forms and are strong candidates for further study.