Dear PF Forum, I have no background in physic In http://math.ucr.edu/home/baez/end.html 1. If an earth size object is left alone (assuming the Sun won't swallow it 2 billions year later). In 101500all of it atoms, oxygen (majority abundant in earth, right), silicon, nitrogen (abundant in atmosphere, right), in short every atom even the heavier ones, uranium, radium, etc... they will become iron? 2. And this iron ball, earth mass, barely chandrasekar (did I type the name correctly) mass will become black hole? 3. If number 2 is true, how long will it take for this iron ball to become black hole. 4. And black hole will evaporate through Hawking Radiation (to photon?). Is this true that an earth size black hole to evaporate completely will takes 2^10^26 years? 5. And finally in simple answer, what is quantum tunnel?