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Gliese 581g is one of the most Earth like planets detected in the habitable zone of its star http://astronomyisawesome.com/solar-systems/cool-facts-about-earth/

from Mashable

One of the Most Earthlike Exoplanets Might Just Be an Illusion

Scientists say that a proposed extrasolar planet, which was hailed as the first potentially habitable planet outside our own solar system, might not exist after all.

from The Huffington Post

Astronomers Find Impossible Planet

55 Cancri e , also named Janssen, is an exoplanet closely orbiting its Sun-like host star 55 Cancri A. The mass of the exoplanet is about 8.63 Earth masses and its diameter is about twice that of the Earth,[4] thus classifying it as the first super-Earth discovered around a main sequence star, predating Gliese 876 d by a year. It takes fewer than 18 hours to complete an orbit and is the innermost known planet in its planetary system. 55 Cancri e was discovered on 30 August 2004. However…

GJ1214b, shown in this artist%u2019s view, is a super-Earth orbiting a red dwarf star 40 light-years from Earth. New observations from the NASA/ESA Hubble Space Telescope show that it is a waterworld enshrouded by a thick, steamy atmosphere. GJ 1214b represents a new type of planet, like nothing seen in the Solar System or any other planetary system currently known.

The Search for a Habitable Planet: Gliese 667Cc As far as extra-solar planet hunting goes, we've found quite a few of them. Most, however, haven't been remotely discussed as being potential candidates to host life as we know it. In fact, hardly any have been discovered inside the Goldilocks region of their star (the area where liquid water could theoretically exist). However, scientists know of one planet that could potentially host life. It has been dubbed the "holy grail