There are a couple of planets that scientists believe have the same qauities as earth but these can't be proven until we have the technology to send satilites to these distance planets.
My research has shown the closest planet that is earth like is 20.5 light years away a planet called Gliese 581 named after it was found orbiting the red dwarf sun Gliese. Astronomers have identified aprox 400 planets in the last 15 years of looking for earth like planets. This planet fits the habitable area of the "Goldilock zone" *
* "Goldilock zone" is the perfect habitable area of a planets distance from the sun which relates to radiation levels and head levels.
This planet has a mass greater than earth by 3 or 4 times and is locked into postion with the star so one side is light the other is dark. This would be that only one side of the planet is habitable for colozation. The orbit of star is around 37 days.
http://www.voanews.com/english/news/science-technology/Astronomers-Find-Potentially-Habitable-Planet-104121519.html
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