Dear PF Forum, I've been searching the answer for this particular question about neutron star in google, but I don't find it, yet. 1. What is the temperature of a neutron star, right after it is formed from supernova? 2. Can anybody give me some timeline about neutron star cooling down? 3. What is the fate of a neutron star? Will the neutron star become a black star after million of year? 4. Does neutron star still produce its own energy? If yes, where does this come from? Is it gravitaty? 5. Does brown dwarf still produce energy? Is it Gravity? Thanks.