Society for Science and the Public
Science News for Students: So Many 'Earths'
Article reports on the recent discovery that many suns in the universe host "Earth-like" planets. Includes a vocabularly list.
BBC
Bbc Newsround: One in Five Suns Has Habitable World
Using the Kepler telescope, NASA scientists have estimated that one in five of suns in space host an Earth-like planet in what is called the habitable zone.