Comparison of sizes and effective temperatures of planets, brown dwarfs, and stars. Displayed are the Sun, the red dwarf star Gliese 229A, the young brown dwarf Teide 1, the old brown dwarf Gliese 229B, the very cool brown dwarf WISE 1828+2650, and the planet Jupiter. Graphic after American Scientist/Linda Huff using NASA satellite images (Sun, Jupiter) and NASA artist work (Gliese 229A + B, Teide 1, WISE1828+2650).