A giant new telescope could reveal signs of life on nearby exoplanets by 2029
For centuries we’ve asked whether life exists beyond Earth. The answer may be closer than ever, thanks to a groundbreaking observatory rising in Chile. The Extremely Large Telescope, with a vast 39-meter main mirror, is designed to collect more light than any telescope to date—even outgunning the James Webb Space Telescope in sheer light-gathering power. That capability opens the door to something extraordinary: detecting possible biosignatures in the atmospheres of distant worlds.
The mission is bold but focused. By dissecting the faint light that passes through or reflects off an exoplanet’s atmosphere, the telescope will search for chemical fingerprints that could hint at biology. According to a study led by Dr. Miles Currie and Victoria Meadows at the University of Washington, the telescope could begin teasing out such signals in as little as about 10 hours of targeted observing time. That is an astonishingly short window for a task that could rewrite our understanding of life in the universe.
One target stands above the rest: Proxima Centauri b. Orbiting the star closest to our Sun at just 4.2 light-years away, this rocky world sits in the habitable zone—where temperatures might allow liquid water. If Proxima b has a stable atmosphere and temperate conditions, the telescope’s powerful instruments could parse its starlight to look for gases commonly associated with life, such as oxygen or methane, alongside water vapor. Any promising detection would be followed by repeat observations to confirm the signal and rule out non-biological explanations.
First observations are slated for early 2029, putting potential breakthroughs less than four years away. Even if definitive signs of life remain elusive at first, the telescope will transform exoplanet science. It will help measure atmospheric composition, cloud cover, temperature profiles, and climate patterns across a variety of worlds, offering insights into how planets form, evolve, and, in some cases, become hospitable.
Here’s how the search works. When an exoplanet passes in front of its star or reflects starlight, molecules in its atmosphere absorb or emit light at specific wavelengths. The Extremely Large Telescope will spread that light into detailed spectra, revealing faint chemical fingerprints hidden in the glare. By comparing patterns over multiple sessions and using advanced analysis, researchers can separate true atmospheric signals from noise and star-related activity.
Why this matters is simple: identifying credible biosignatures on a nearby world would rank among humanity’s greatest discoveries, reshaping science, philosophy, and our plans for future exploration. Even null results are valuable, narrowing our list of promising targets and refining the strategies for next-generation missions.
As construction progresses in Chile, astronomers are building a shortlist of top candidates, with Proxima Centauri b high on the list, alongside other nearby, potentially habitable exoplanets. With its unprecedented light-collecting area and precision spectroscopy, the Extremely Large Telescope is poised to lead the next leap forward in the search for life beyond Earth. The countdown has begun.
