A Swiftly Rotating Brown Dwarf (Illustration)
Jet Propulsion Laboratory https://www.jpl.nasa.gov/ April 7, 2021
The faster a brown dwarf spins, the narrower the different-colored atmospheric bands on it likely become, as shown in this illustration. Some brown dwarfs glow in visible light, but they are typically brightest in infrared wavelengths, which are longer than what human eyes can see.