Cornell Astronomers Identify 45 Prime Exoplanet Candidates in the Search for Extraterrestrial Life

Researchers at Cornell University’s Carl Sagan Institute have made a significant breakthrough in the quest for life beyond Earth by meticulously sifting through a database of more than 6,000 known exoplanets. This rigorous analysis, which was detailed in a study published on March 19, 2026, in the Monthly Notices of the Royal Astronomical Society, has pinpointed 45 rocky planets. These specific worlds are situated within the habitable zones of their respective stars, providing the theoretical conditions necessary for liquid water to exist on their surfaces.

Professor Lisa Kaltenegger, the director of the Carl Sagan Institute, emphasized that this newly curated catalog will serve as a vital roadmap for upcoming observational missions. The list is designed to guide the James Webb Space Telescope (JWST), the Nancy Grace Roman Space Telescope—slated for launch in late 2026 or 2027—and the ground-based Extremely Large Telescope (ELT), which is expected to achieve first light in March 2029. To compile this focused inventory, the research team utilized the latest data from the European Space Agency’s (ESA) Gaia mission alongside the NASA Exoplanet Archive.

By applying a more stringent analysis that accounts for three-dimensional habitable zones, the researchers further narrowed the selection to 24 planets that receive radiation levels most comparable to Earth. Within this elite group, 10 planets were identified as receiving energy radiation almost identical to that of our Sun. Study co-author Gillis Louri, a graduate of San Francisco State University, noted that identifying these high-priority targets is a fundamental first step for any successful observational program aiming to detect signs of life.

Among the most promising candidates for immediate investigation by the JWST are TRAPPIST-1 e and TOI-715 b. These planets orbit small red dwarf stars, a configuration that makes it significantly easier for astronomers to detect and characterize their atmospheres. While red dwarfs are known for emitting intense ultraviolet radiation, planets positioned further out, such as TRAPPIST-1 e, may be capable of maintaining stable atmospheres. Located approximately 40 light-years from Earth, these systems are within reach for direct biosignature searches using current and near-future technologies.

The research, titled Probing the limits of habitability: a catalog of rocky exoplanets in the habitable zone, was a collaborative effort involving Professor Kaltenegger, an undergraduate student, and two recent Cornell graduates. By studying planets at the edges of habitable zones or those with highly elliptical orbits, the team hopes to empirically test theories regarding the factors that might hinder the evolution of life, such as fluctuating thermal conditions.

The JWST has already proven its capabilities in atmospheric spectroscopy by detecting carbon dioxide and methane in the atmosphere of K2-18 b, signaling a new era in exoplanetary science. Consequently, this refined list of 45 planets provides a strategic blueprint for astronomical exploration over the next decade. It offers a clear path forward for scientists dedicated to answering the ancient question of whether we are alone in the universe.