Super-Earth GJ 3378 b: A Promising Candidate for Life 25 Light-Years Away
Astronomers have identified GJ 3378 b, a super-Earth located just 25 light-years away in the constellation Camelopardalis, as a promising candidate in the search for extraterrestrial life. The planet orbits a red dwarf star and has been re-evaluated as having approximately 2.3 times the mass of Earth, according to a recent study published in The Astrophysical Journal by researchers at UC Irvine.
Originally detected in 2024, GJ 3378 b was thought to have a mass of 5.26 Earth masses, placing it in the sub-Neptune category. However, the latest analysis using data from the Habitable-zone Planet Finder and the NEID spectrograph has refined its mass and orbital period to 21 days, situating it within the star's habitable zone.
The planet receives about 90% of the starlight that Earth receives from the Sun, suggesting conditions that could support liquid water. However, its proximity to a red dwarf raises concerns about atmospheric erosion due to stellar flares and winds.
Despite its potential, GJ 3378 b does not transit its host star, limiting current atmospheric characterization methods. Future missions, such as NASA's planned Habitable Worlds Observatory, may be needed to directly image the planet and search for biosignatures.