The brown star also called a failed star. It is named thusly as it cannot sustain the fusion energy as normal stars do and end up burning out. Most of the result of a cold rock slightly bigger than Jupiter, but smaller than a star.
This brown star has been named WISE 0855. It is located 7.2 light years from the earth. Scientists believe that suffice it being found outside of the solar system, its extremely low (lower than any temperature ever recorded) help it accumulate enough water to hold in cloud form.
"It's extremely low temperature makes it the first object after Earth, Mars, Jupiter and Saturn likely to host water clouds in its visible atmosphere," said a statement from NASA. "Our spectrum shows that WISE 0855 is dominated by water vapor and clouds, with an overall appearance that is strikingly similar to Jupiter. Now that we have a spectrum, we can actually start thinking about what's going on in this object."
The study also says that the conditions on the planet are less extreme than in Jupiter as it does not have to exist around radioactive gasses that are constantly exploding. They also observed from the spectrum that its outer layer has a shimmering effect typical of a failing star.