11/26/2025
Astronomers have discovered an Earth-sized planet only 40 light years away that sits in the habitable zone where liquid water and even life could exist. According to ScienceAlert, the planet is called Gliese 12 b and was identified in May 2024 using NASA’s Transiting Exoplanet Survey Satellite. It has a radius very similar to Earth’s, suggesting it is rocky, and it orbits a cool red dwarf star named Gliese 12 that is about 27 percent the size of our Sun. The planet completes an orbit every 12.8 days, placing it at just the right distance for potentially temperate conditions.
What makes Gliese 12 b especially exciting is its position in the habitable zone. According to UCL News, this is the region around a star where temperatures could allow oceans and clouds to form. Scientists believe this planet offers one of the clearest opportunities yet to study whether Earth-like worlds can sustain atmospheres and climates suitable for life. Its host star is relatively calm compared to other red dwarfs, which reduces the risk of harmful radiation stripping away any atmosphere.
Researchers are now preparing to use the James Webb Space Telescope to study Gliese 12 b more closely. According to NBC News, Webb will be able to analyze the planet’s atmosphere and search for signs of water v***r, clouds, and possibly biosignatures. If Gliese 12 b retains a thin atmosphere, it could resemble a temperate version of Venus or Earth. At just 40 light years away, it is close enough in cosmic terms to provide scientists with a nearby laboratory for testing theories about planetary habitability and the conditions needed for life beyond Earth.