The Kepler team just announced the confirmed existence of an Earth-sized planet orbiting in the habitable zone of its host star.
This planet is about 500 light years away from our solar system in the constellation Cygnus the swan. It's orbiting an M-dwarf star, also known as a red dwarf, which are the most abundant known stars in our Milky Way galaxy.
The planet's orbit is about 130 days, compared to our 365 days, and since the star is much cooler than the Sun, receives about 1/3 of the solar radiation. The warmth of the planet is unknown, because that would depend on composition of its atmosphere, which has not been established at this point.
Read more here: http://www.nasa.gov/ames/kepler/nasas-kepler-discovers-first-earth-size-planet-in-the-habitable-zone-of-another-star/#.U1AaGvldWSp
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