Artist's concept of the planet 55 Cancri e. It falls into a class of planets termed super Earths, which are more massive than our home world but lighter than giant planets like Neptune. 55 Cancri e is about twice as big and eight times as massive as Earth. The planet orbits a bright star, called 55 Cancri, in a mere 18 hours.
Super-Earths: New Planets Found! - Astronomers working at the European Southern Observatory (ESO) in Chile have discovered seven planets orbiting the star Gliese 667C. Two exoplanets have been discovered in the star's habitable zone, which has just the right range of distance where liquid water can exist on a planet's surface.