Researchers at the Harvard-Smithsonian Center for Astrophysics have announced a breakthrough in the search for Earth-like worlds. The exoplanet LHS 1140 b, located 48 light-years away, is the first rocky body in the habitable zone for which an atmosphere has been confirmed. The findings, published in the journal Science, are based on observations taken in 2024 and 2025 and represent a concrete step toward understanding how common conditions favorable to life may be.
Helium signatures reveal LHS 1140 b's atmosphere
Astronomers detected spectral signatures of helium escaping from the planet, demonstrating that LHS 1140 b has retained a gaseous envelope for at least 3 billion years. The presence of an atmosphere is essential for life as we know it: on Earth, it allows water to remain liquid and regulates surface temperature. Without an atmosphere, a rocky planet in the habitable zone would expose its surface to space radiation and extreme temperature swings.
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A planet in the Goldilocks zone
LHS 1140 b orbits a cool red dwarf at a distance that allows liquid water on its surface. Discovered in 2017, the planet was long considered a promising candidate, but only now have scientists confirmed that it meets three key requirements: rocky composition, location in the habitable zone, and the presence of an atmosphere. As Robin Wordsworth, co-author of the study, stated: "Twenty years ago we wondered whether other terrestrial-type planets existed; now we know at least one has kept its atmosphere."
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To detect the atmosphere from 48 light-years away, researchers identified helium leaks using physical models to reconstruct the gas escape process. The technique proved effective and paves the way for future observations with more powerful instruments, such as the James Webb Space Telescope, to analyze the atmosphere's lower layers.
Comparisons with the tech sector and future implications
While astronomers celebrate this milestone, other technology sectors face regulatory and legal challenges. For instance, the debate over robotaxis in Washington D.C. involves companies like Uber and Waymo, as reported in this article. Meanwhile, the race for innovation pushes companies like Apple to protect intellectual property, as highlighted by the legal preservation letters sent to former employees.
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The discovery of LHS 1140 b does not prove the existence of life, but it demonstrates that atmospheres can persist for billions of years on rocky planets. The upper layers are dominated by helium, but the lower layers may contain heavy gases such as nitrogen, carbon dioxide, or carbon monoxide. To verify the presence of oceans or other habitable features, more detailed observations are needed. For further reading, see the Wikipedia page on LHS 1140 b.
Source: https://www.wired.com/story/search-for-earth-like-planet-step-forward
