Nearby 25-light-year world could host oceans in its star’s habitable zone

Astronomers refine the mass of exoplanet GJ 3378b to about 2.3 Earth masses, placing it in the rocky super-Earth category and locating it in the habitable zone of a nearby red dwarf 25 light-years away. It orbits its star every 21 days, suggesting temperatures that could support liquid water, but the planet’s atmosphere remains uncertain due to intense stellar radiation; since it does not transit, atmospheric confirmation may have to wait for future missions like NASA’s Habitable Worlds Observatory in the 2040s.