In a study, Austrian astronomer and astrophysicist Lisa Kaltenegger has identified 45 potentially habitable exoplanets—planets outside our solar system—that could harbor life. The findings, published in the journal Monthly Notices of the Royal Astronomical Society by Kaltenegger and her team from Cornell University, mark a significant step forward in the quest to understand where life might exist beyond Earth.
A New Frontier in the Search for Life
Kaltenegger, a professor at Cornell University, collaborated with students and alumni to analyze data from the European Space Agency’s Gaia mission and NASA’s Exoplanet Archive. Her research highlights 45 exoplanets that orbit within their stars’ “habitable zones”—regions where temperatures could allow liquid water to exist on a planet’s surface. Liquid water is widely considered a key ingredient for life as we know it, making these planets prime candidates for further exploration.
“Our latest findings reveal an exciting diversity of exoplanets that may host life,” Kaltenegger said. “These 45 planets all lie within the habitable zone of their stars—where conditions could allow liquid water to exist.”
Narrowing the Search: Focus on Rocky Worlds
With over 6,000 exoplanets discovered so far, the study narrows the search to a small subset of candidates. The team focused on rocky planets (similar in composition to Earth) located in their stars’ habitable zones. These regions are defined by temperatures that are neither too hot nor too cold—conditions where liquid water could theoretically exist under the right atmospheric conditions.
However, the mere presence of a planet in the habitable zone does not guarantee it is habitable. A stable atmosphere plays a critical role in maintaining surface temperatures and enabling liquid water. Without such an atmosphere, even a planet in the “goldilocks zone” could be inhospitable to life.
A Targeted Approach to Studying Alien Life
Kaltenegger’s research aims to make the search for extraterrestrial life more efficient by prioritizing these 45 high-potential exoplanets. Instead of surveying thousands of distant worlds, scientists can now focus observational efforts on candidates with the most favorable conditions.
The study sets the stage for detailed investigations using advanced telescopes like NASA’s James Webb Space Telescope (JWST), which is capable of analyzing planetary atmospheres and searching for biosignatures—chemical indicators that could suggest life. “These planets are now prime targets for follow-up observations,” Kaltenegger explained.
Expanding Our Understanding of Habitability
Beyond identifying potential homes for life, the research also seeks to clarify the boundaries of habitability. For example, it explores how much radiation a planet can withstand and whether planets with unusual orbital patterns—such as those that experience extreme seasonal variations or prolonged eclipses—could still support life.
“Understanding these limits is crucial,” Kaltenegger noted. “Even if a planet is not Earth-like in every way, it might still harbor conditions that could allow life to thrive.”
A Legacy of Discovery
Lisa Kaltenegger’s work exemplifies the power of interdisciplinary collaboration and cutting-edge technology in unlocking the mysteries of the universe. As her team continues to refine their models and analyze new data, the search for alien life moves closer to a defining moment in human history.
The identification of these 45 exoplanets is not just a scientific milestone—it’s a reminder that Earth may be far from unique in the cosmos. With each discovery, we edge closer to answering one of humanity’s most profound questions: Are we alone?
Source: “Phys,” European Space Agency (ESA), and NASA Exoplanet Archive.
Here is a complete list of the 45 potentially habitable rocky planets identified in Lisa Kaltenegger’s recent study (2026). The list is sorted by their approximate distance from Earth in light-years (ly).
Catalog of 45 Rocky Planets in the Habitable Zone
| Planet Name | Distance (approx. ly) | Key Characteristic |
|---|---|---|
| Proxima Centauri b | 4.2 | Closest exoplanet; receives Earth-like radiation. |
| GJ 1061 c | 12.0 | Nearby target for testing the inner edge of habitability. |
| GJ 1061 d | 12.0 | Receives radiation levels very similar to Earth. |
| GJ 273 b (Luyten’s Planet) | 12.4 | Nearby super-Earth candidate for atmosphere studies. |
| Teegarden’s Star c | 12.5 | One of the highest Earth Similarity Indices (ESI). |
| Wolf 1061 c | 14.0 | Rocky planet around a nearby red dwarf. |
| GJ 1002 b | 15.8 | Located in the habitable zone of a very quiet star. |
| GJ 1002 c | 15.8 | Second habitable zone planet in the GJ 1002 system. |
| GJ 682 b | 16.3 | Nearby planet often cited in habitability catalogs. |
| GJ 3323 b | 17.5 | Rocky planet within the conservative habitable zone. |
| GJ 251 c | 18.2 | Companion to a nearby red dwarf star. |
| GJ 667 C c | 23.6 | Famous super-Earth in a triple star system. |
| GJ 667 C e | 23.6 | Additional candidate in the Gliese 667 system. |
| GJ 667 C f | 23.6 | Third potential planet in the same system. |
| Wolf 1069 b | 31.2 | Receives almost exactly the same radiation as Earth. |
| L 98-59 f | 34.6 | Orbits a bright star, making it a good JWST target. |
| Ross 508 b | 36.5 | Discovered via infrared spectroscopy. |
| TRAPPIST-1 d | 40.0 | Part of the famous 7-planet system. |
| TRAPPIST-1 e | 40.0 | Considered one of the best candidates for liquid water. |
| TRAPPIST-1 f | 40.0 | Centrally located within the habitable zone. |
| TRAPPIST-1 g | 40.0 | Tests the outer, colder limit of habitability. |
| LHS 1140 b | 48.8 | Potential “water world” with a nitrogen atmosphere. |
| TOI-700 d | 101.4 | Earth-sized planet in a quiet, stable system. |
| TOI-700 e | 101.4 | Second habitable planet discovered in the TOI-700 system. |
| LP 890-9 c | 105.0 | Orbits one of the coolest stars known to host planets. |
| TOI-1266 d | 120.0 | Small planet in a multi-planet system. |
| TOI-715 b | 137.0 | “Super-Earth” and a top priority for JWST. |
| K2-3 d | 144.0 | Important target for studying the inner HZ boundary. |
| K2-239 d | 160.0 | Transiting planet ideal for atmospheric analysis. |
| K2-72 e | 217.0 | Small, potentially rocky planet. |
| K2-288 B b | 226.0 | Discovered orbiting in a binary star system. |
| Kepler-1649 c | 300.0 | Extremely similar to Earth in both size and temperature. |
| Kepler-186 f | 580.0 | The first Earth-sized planet found in a habitable zone. |
| Kepler-296 e | 737.0 | Part of a multi-planet system around a red dwarf. |
| Kepler-296 f | 737.0 | Outer companion in the Kepler-296 system. |
| Kepler-1652 b | 822.0 | Receives Earth-like radiation levels. |
| Kepler-1229 b | 870.0 | Rocky planet orbiting a red dwarf. |
| Kepler-441 b | 926.0 | Tests the outer boundary of the habitable zone. |
| Kepler-1544 b | 1,138 | Rocky planet in the conservative habitable zone. |
| Kepler-1410 b | 1,196 | Super-Earth located in the habitable zone. |
| Kepler-62 e | 1,200 | Modeled by Kaltenegger in 2013 as a potential water world. |
| Kepler-62 f | 1,200 | Companion to 62e; located at the outer HZ edge. |
| Kepler-442 b | 1,200 | Often cited as more “super-habitable” than Earth. |
| Kepler-452 b | 1,400 | “Earth’s older cousin” orbiting a Sun-like star. |
| Kepler-1606 b | 2,700 | One of the most distant candidates on the list. |
