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Relative size and left-to-right appearance: the sun, a very cold star, a warm brown dwarf, a cooler brown dwarf, and finally Jupiter. Scientists have found stormy and cloudy atmospheres on brown dwarfs – dying stars, smaller in mass than conventional stars, but larger than giant planets. giant like our Jupiter. Fitness weightlifting life lessons poster, This discovery belongs to scientists from NASA and University of California, Los Angeles. Fitness weightlifting life lessons poster. It was not until recently that brown dwarfs existed. They are burning objects, but not large enough to sustain fusion reactions like stars do.