Astronomers Identify Promising Super-Earth in Nearby Star System

The planet, roughly twice the size of Earth, was identified using the Habitable-zone Planet Finder at Texas’s McDonald Observatory and the NEID spectrometer in Arizona. According to lead author Paul Robertson, the proximity of GJ 3378b—a mere cosmic stone's throw in the scale of the Milky Way—makes it an ideal target for high-resolution observation. The planet receives approximately 90 percent of the stellar radiation Earth gets from the sun, placing it in an optimal "sweet spot" for liquid water.

Despite the excitement, the existence of a vital atmosphere remains unconfirmed. Researchers are currently investigating whether the planet sits above the "cosmic shoreline," a gravity threshold required to retain an atmosphere against stellar radiation. The fate of Mars, which lost much of its protective gases over time, serves as a sobering reminder of how easily such conditions can fail. For now, confirming the presence of an atmosphere is the next hurdle for astronomers, as it is a prerequisite for detecting biosignatures or liquid water. Future analysis using next-generation observatories will determine if this neighbor is truly capable of supporting life.