Without better telescopes scientists won't know for sure, but this "super-Earth" has the most promise to support life so far.
Scientists say the so-called super-Earth could be habitable if all the conditions are right.
An artist's conception of a Jupiter-like planet floating freely without a parent star. Image: NASA/JPL-Caltech/R. Hurt
Study suggests there are nearly twice as many of these Jupiter-sized planets as stars.