هوپا، انجمن علم ایران

This is a surprising result, because the volume is large.
For instance, the black hole Sagitarius [tex]A^*[/tex] has radius
[tex]\sim 10^6[/tex]km and age  [tex]\sim 10^9[/tex]years. Inside it, there is space for
 [tex]\sim 10^{34}km^3[/tex], enough to fit a million Solar Systems!