For astronomers the only three measurable physical properties that completely specify the characteristics of a black hole are its mass, its charge and its angular momentum.
Facts:
You Can't Directly See a Black Hole. ...
Our Milky Way Probably Has a Black Hole. ...
Dying Stars Lead to Stellar Black Holes. ...
There are Three Categories of Black Holes. ...
Black Holes Are Funky. ...
The First Black Hole Wasn't Discovered Until X-Ray Astronomy was Used.
