There are recent discoveries that deep inside Saturn (and the other gas giants) it is believed to be very hot (8000ºC), and extremely high pressure (megabars) so that
diamonds are generated.
According to
this page the energy output of Saturn is 2.5 times as much as the input from the Sun (which is 160e15 W). So an energy output of 400e15W compared to the Sun (380e24 W) is still very tiny (1 billionth), but it does emit energy.
So actually Saturn is a veryveryvery tiny star.
What are your opinions ?