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

Other solar systems could cram in as many as seven Earth-like planets - CNET

Earth-Size Planets Come in Two Flavors: Rocky or Gassy

What the Earth-Sized Planet Discovery Means, At the Smithsonian

Scientists discover 7 “Earthlike” planets orbiting a nearby star – The Denver Post

Giant Exoplanets Are Potential 'Agents of Chaos' in Multiplanet Systems, Astronomers Say

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

Planetary system's second Earth-size world discovered

Kepler finds Earth-size planet in 'goldilocks' zone

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

Fact Check: Did Astronomers Find a Planet More Habitable Than Earth?

Earthlike planet found in Goldilocks zone - Newsday

What Would Signal Life on Another Planet?, Science

Planet - Wikipedia

Kepler-62 and the Solar System – Exoplanet Exploration: Planets Beyond our Solar System

Scientists discover potentially habitable planets, MIT News