First Atmosphere Found on Earth-Like Planet in Habitable Zone

First atmosphere found on Earth like – Scientists have achieved a historic milestone with the first atmosphere found on Earth-like planet orbiting within the habitable zone of a distant star. This groundbreaking discovery marks the inaugural time astronomers have confirmed an atmospheric envelope surrounding a rocky world positioned in the optimal temperature range for potential life. The finding provides compelling evidence that celestial bodies with conditions similar to our own may exist beyond the solar system boundaries.

The planet, known as LHS 1140 b, sits approximately 48 light-years from Earth and circles a red dwarf star significantly smaller and cooler than our Sun. While the detected atmospheric layer contains helium—a gas that cannot sustain life independently—researchers believe additional gases likely exist at lower altitudes. This represents the first atmosphere found on Earth-class planet, opening new possibilities in the search for habitable worlds.

A Pivotal Moment for Astronomy

Dr Collin Cherubim, lead author from Harvard University, described this achievement as highly significant for planetary science. He emphasized that this discovery marks the first time astronomers have identified an atmospheric envelope on a terrestrial planet located within another star’s habitable region. The achievement demonstrates that detecting atmospheres around rocky exoplanets is now possible with current technology.

“People are generally interested in the big questions: Are we alone? Is there life beyond the Earth or beyond our solar system?” Dr David Charbonneau from Harvard explained. “To that end, this study reveals the first atmosphere discovered on a rocky planet in the habitable zone of a star outside of our solar system.”

The research team published their findings in the prestigious journal Science. While they caution that extraterrestrial life has not yet been confirmed, they emphasize that such a discovery requires specific conditions. A world must maintain liquid water, which necessitates positioning at an optimal distance from its host star—neither excessively hot nor too cold for water to remain in liquid form.

The Goldilocks Zone and Future Discoveries

Planetary scientists refer to this ideal temperature range as the “Goldilocks zone,” drawing inspiration from the classic fairy tale character known for her preferences regarding porridge temperature. Although hundreds of planets have been identified within these habitable regions, only a select few dozen qualify as small and rocky, similar to Earth. This characteristic further enhances their potential to harbor life and makes each new discovery particularly valuable.

Historically, none of these rocky candidates had been confirmed to possess an atmosphere. That changes with the current discovery of the first atmosphere found on Earth-like planet. The helium detected likely resides in the upper atmospheric layers, but scientists remain hopeful that more life-sustaining gases may exist closer to the surface. This finding validates the approach of using advanced telescopes to analyze exoplanet atmospheres.

LHS 1140 b is not the sole world capturing scientific attention in the quest for extraterrestrial life. K2-18b, classified as a sub-Neptune with a potentially water-rich interior, previously made headlines when researchers observed indications of dimethyl sulphide—a compound associated with marine organisms on Earth. However, a NASA-led reanalysis conducted in 2025 determined that the signal was insufficiently strong for definitive confirmation, demonstrating that this gas can also form through non-biological processes.

Additionally, the seven rocky planets orbiting TRAPPIST-1 continue to generate considerable interest. NASA’s James Webb Space Telescope has eliminated the possibility of an Earth-like atmosphere on TRAPPIST-1d, while data concerning TRAPPIST-1e remain inconclusive. With more than 6,000 worlds already catalogued orbiting distant stars, each new discovery brings humanity incrementally closer to potentially answering one of science’s most profound questions about our place in the universe.