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Originally Posted by 2HousePlague
Density. Period. Theoretically, any mass -- if compressed to small enough space -- can become a black hole. On the flipside, if you release all the energy in a grain of salt, it would boil an olympic-size swimming pool for several hours -- 
2hp |
I'm pretty sure this is the right answer.
Any kind of mass can implode if the right conditions occur.
I'm also pretty sure that stars are the only things we know of that implode under thir own weight like this.