(G=EMC^2 Glazier) wrote in news:25367-466F0DEB-
:

They are not a planet. They are not a star What is the best
definition used to describe them? Is Jupiter a brown dwarf? It does not
look brown. Black dwarfs are a white dwarf that has cooled to a point
it no longer gives off heat(I think???) Bert



Brown dwarfs have sufficient mass to trigger deuterium burning in their
core. Eventually the deuterium runs out and all nuclear reactions stop. A
star must have sufficient mass to at least initiate the p-p chain. Jupiter
doesn't make the grade of either star or brown dwarf.

Klazmon.