http://news-info.wustl.edu/tips/2002/science-tech/brown_dwarf.html

Brown dwarfs, which have been described as "failed stars," are celestial bodies more massive than planets like Jupiter but not large enough to sustain the thermonuclear reactions that make a star shine. In the June 1, 2002 issue of Astrophysical Journal Letters, Katharina Lodders, a senior research scientist in the Planetary Chemistry Lab at Washington University in St. Louis -- along with researchers from UCLA, NASA and other institutions -- reported the first evidence for the existence of changing weather patterns on brown dwarfs. They are the first non-planetary objects to exhibit such phenomena.