<ul><li>Brown dwarfs are a unique category of celestial objects, bigger than planets but smaller than stars.</li><li>They are not actually brown; the largest ones emit a steady glow of radiation and resemble red dwarfs.</li><li>Unlike stars, brown dwarfs do not generate energy through nuclear fusion for long; they emit radiation from the leftover heat of their formation.</li><li>While they cannot sustain hydrogen fusion in their cores like stars, they can engage in a brief fusion reaction involving deuterium.</li></ul>

What Makes Brown Dwarfs So Weird?

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