Kinds of Black Holes
Rotating Black Holes
In 1963 the New Zealander Roy Kerr (see photo on right) figured out how to describe rotating black holes. These "Kerr" black holes rotate at a normal speed. Their size and shape depend only on their mass and how quickly they are rotating.
Description of Rotations:
Zero-The black hole looks the
same from all directions.
One-The black hole looks
different from different
Two-The black hole looks the
same if it makes half of a full
If the rotation is zero, the black hole is perfectly round and is identical to a non-rotating black hole.
If the rotation is one or two, the black hole bulges near its equator. The more quickly it rotates, the more it bulges.
Scientists have figured out that black holes eventually settle down and stop rotating.