Earth-like Exoplanet 49 Light-Years Away Discovered with Atmosphere

Scientists have announced the first confirmed detection of an atmosphere around a rocky exoplanet located outside our solar system and residing within its star’s habitable zone. The planet, orbiting a sun‑like star 49 light‑years from Earth, is roughly the size of Earth and receives a similar amount of stellar radiation, conditions that could allow liquid water to persist on its surface. The discovery marks a milestone, as previous atmospheric detections have largely been limited to gas giants and sub‑Neptune‑sized worlds, with only tentative evidence for rocky planets beyond their habitable zones.

Using high‑resolution spectroscopy from the James Webb Space Telescope, the research team identified absorption features of water vapor and other molecules in the planet’s transmission spectrum. The data suggest a relatively thin, but stable, atmosphere that could support surface pressures conducive to liquid water. The planet’s equilibrium temperature, estimated from its orbital distance and stellar luminosity, falls within the range that would permit water in liquid form, making it a prime target for future studies of atmospheric composition and potential biosignatures.

This finding expands the catalog of potentially habitable worlds and demonstrates the feasibility of probing the atmospheres of Earth‑size planets with current instrumentation. Follow‑up observations are planned to refine the planet’s atmospheric profile and to search for additional molecules that might indicate geological or biological processes. The discovery underscores the growing capability of astronomers to investigate the conditions of distant rocky planets in the quest to understand the prevalence of life‑supporting environments in the galaxy.