In a groundbreaking discovery, astronomers have confirmed an atmosphere surrounding LHS 1140 b, a rocky exoplanet located in its star’s habitable zone. This finding brings scientists closer to understanding which distant worlds may support life.
- LHS 1140 b is 48 light-years from Earth in the habitable zone.
- Helium escaping from the planet confirms the presence of an atmosphere.
- The atmosphere may have lasted over three billion years, suggesting potential for habitability.
What happened
Astronomers observed helium gas escaping from the rocky exoplanet LHS 1140 b, confirming for the first time that a terrestrial planet outside our solar system has retained an atmosphere. Using the WINERED spectrograph at Chile’s Magellan Observatory, scientists detected the helium signature while the planet transited its host star, a red dwarf.
This discovery was made possible by a rare event where LHS 1140 b and another planet crossed their star simultaneously. Unlike the companion world, LHS 1140 b showed clear evidence of an atmosphere, supporting the prediction made by a theoretical model developed by researchers at Harvard University.
Why it feels good
Finding an atmosphere on a rocky planet in the habitable zone is a key milestone in the search for extraterrestrial life. It confirms that not only do Earth-like planets exist around other stars, but some may hold onto conditions necessary for life, such as stable atmospheres that could protect surface water.
The ability to detect atmospheric gases escaping into space from distant exoplanets opens new possibilities for studying these worlds in greater detail. With LHS 1140 b’s atmosphere possibly lasting more than three billion years, scientists have an invaluable natural laboratory to explore habitability beyond Earth.
What to enjoy or watch next
Researchers plan to analyze the full chemical makeup of LHS 1140 b’s atmosphere to better understand its potential for habitability, including whether surface oceans or other life-supporting features exist. The data gathered could reshape how we search for life-supporting planets in the galaxy.
The success of this detection encourages astronomers to use similar methods to find atmospheres on other rocky exoplanets. This initial breakthrough may soon lead to many more discoveries about the nature and diversity of potentially habitable worlds in our cosmic neighborhood.