Why do we have Earth weighting trillions of tons and not forming a black hole, but then it I compress earth to a sphere of 10mm I get a black hole?
If the amount of energy in this small sphere is the same as the earth in terms of mass (they have the same mass, just different sizes), how come one is a black hole and the other is not?
What defines a black hole? Huge mass, or small size high density? If I compress an ant enough can I make a black hole out of her?