A paper published on 1 July 2026 confirmed GJ 3378b, a planet roughly twice Earth's diameter, orbiting inside the habitable zone of its host star, a red dwarf about 25 light-years from Earth.
Twenty-five light-years sounds vast, and in any everyday sense it is. But in galactic terms, it's practically next door. Light that left GJ 3378b's star system a quarter-century ago is only now reaching telescopes on Earth, which makes it one of the closer habitable-zone candidates found in recent years, close enough that a sufficiently large future telescope could plausibly attempt to study its atmosphere directly rather than just infer its existence from a star's wobble or dimming.
Habitable zone is doing a lot of work in that description, and it's worth being honest about what it means and doesn't. It describes the range of distance from a star where liquid water could exist on a planet's surface, given the right atmosphere and conditions. It says nothing about whether a planet actually has water, an atmosphere at all, or anything resembling the conditions life needs. Plenty of habitable-zone planets are almost certainly barren, either sterilised by stellar flares (red dwarfs are volatile) or stripped of atmosphere entirely.
What GJ 3378b has going for it right now is proximity and plausibility, not confirmation. Follow-up observations, likely involving the James Webb Space Telescope or its successors, would be needed to say anything about its atmosphere or surface conditions, and none of that work has been scheduled yet. For now, it's a promising target on a list that's grown considerably longer over the past decade, not a discovery of life, or even evidence that life is possible there.