Gliese 581 c
Gliese 581 c is a planet that astronomers believe that we could one say live on despite the extremely dangerous nature of it. Gliese 581 c is so close to it's star that it has stopped spinning all together. On one side (the side that is always facing the sun) the planet is a hellish wasteland with extreme temperatures, and on the other side (the side that is never facing the sun) is always dark and covered in freezing temperatures. Although you may think that this is the last planet that you would want to stay on, if you were to go directly in the middle you would more than likely be able to survive.