Being in the Habitable Zone Doesn't Guarantee Air: The 'Cosmic Shoreline' That Separates Planets
July 16, 2026GJ 3378 b, a super-Earth found 25 light-years away, sits right in the middle of its habitable zone, soaking up about 90% as much starlight as Earth gets from the Sun. But the real test for finding life isn't distance — it's whether a planet can hold onto its atmosphere. SORABUMI explains the new yardstick astronomers call the cosmic shoreline.