Brown dwarfs are objects intermediate between stars and planets.
The temperatures and pressures at their centers are insufficient to sustain the nuclear reactions that provide stars with their longlasting source of energy. Lacking the source of energy that provides stars with a force preventing collapse under their own weight, brown dwarfs continue to shrink, cool, and fade out almost indefinitely after they are formed. Since then, the number of known brown dwarfs has kept increasing, reaching about one dozen nowadays. When they are very young, brown dwarfs shrink rather rapidly, releasing large amounts of gravitational potential energy that makes them relatively bright and hot. I star forming region.