Our solar system hosts a cornucopia of worlds, from the hellfire of Venus to the frozen plains of Mars to the mighty winds of Uranus. In that range, the Earth stands alone, with no planet coming close to its life-friendly position near the sun.
Outside our solar system, however, it's a different story. Observations using space-based and ground-based telescopes have indicated that a new class of objects dubbed super-Earths – worlds that are about two to 10 times our planet's mass and up to two times its radius – could be among the most common type of planets orbiting other stars.....
http://www.nbcnews.com/science/search-f ... 2D11741837
And here is 9 exoplanets (super earth) that are in the habitable zone of their star.
http://www.space.com/18790-habitable-ex ... hotos.html