Second Earth-sized World Found in System's Habitable Zone – Exoplanet Exploration: Planets Beyond our Solar System

Second potentially habitable Earth-size planet found orbiting nearby star

Habitable zone - Wikipedia

Kepler Spots Closest Thing Yet to Another Earth

Eight new planets found in Goldilocks Zone — Harvard Gazette

Astronomers Have Found Another Possible 'Exomoon' beyond Our Solar System

Scientists Just Found Five Star Systems Capable of Supporting Life - Interesting Engineering

NASA says exoplanet named K2-18 b could harbor life: What we know

NASA's Kepler Telescope Finds What May Be an Earth-Size Planet - The New York Times

The Past, Present, and Future of Faraway Worlds - The Ringer

Planetary system's second Earth-size world discovered

Giant gas planets may prevent life in other solar systems

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