Quote:
Originally Posted by xelasnave
I find it impossible to imagine 20 billion solar masses compacted to a point smaller than the head of a pin.
I could imagine an object of some reasonable size having the mass observed but to suggest something infinitely small seems unrealistic.
What is at the core of a black hole?
Do scientists believe to find a singularity or something more akin to a pulsar..
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You should consider a black hole to be the entire space inside the Schwarzschild radius.
The Schwarzschild radius is proportional to the mass with a proportionality constant involving the gravitational constant and the speed of light:
r_s=2*G*m/(c**2)
where:
r_s is the Schwarzschild radius;
G is the gravitational constant (6.67384e-11);
m is the mass of the object;
c is the speed of light in vacuum (299792458).
For 20 billion solar masses that is 5.9e13 metres or 395 Au