Like Magnetic Accretion, this is an illustration of a type of cataclysmic binary called a polar. However, this is a polar with a difference, for there is a sub-stellar object called a brown dwarf (left) in orbit around the magnetic white dwarf (right). In all other known polars, it is a red dwarf rather than a brown dwarf which is donating material to the white dwarf. This image was commissioned by astronomers at the University of Leicester, UK. For more brown dwarfs, see Brown Dwarf I and Brown Dwarf II.