Inner and outer horizon of black hole

[sadegh4137]

hi
some black holes are inner and outer horizon!
what's this means?
inner and outer?
what happen between them?

 

[DeIdeal]

Assuming you're talking about the ergosphere: Any black hole with nonzero angular momentum has, in addition to the event horizon, an ergosphere, ie a surface inside which (but outside the event horizon) an object cannot remain stationary but can still "escape" the black hole (an object cannot escape once it passes the event horizon). That should be a concise qualitative description, and it should actually answer all three questions you posted in the OP (on a qualitative level).

 

[George Jones]

The outer horizon of a rotating black hole is an event horizon, and the inner horizon is a Cauchy horizon.

 

[Naty1]

Illustration and description here:

http://en.wikipedia.org/wiki/Kerr_black_hole#Important_surfaces

 

[sardar]

The inner and outer horizon of a black hole refer to the two boundaries that define the region around the black hole where the gravitational pull is so strong that even light cannot escape. The inner horizon is the point of no return, beyond which nothing, including light, can escape the black hole's gravitational pull. The outer horizon is the boundary where the escape velocity is equal to the speed of light.

What happens between the inner and outer horizon is still not fully understood, as the extreme gravity and curvature of space-time make it difficult to study. However, it is believed that as objects approach the inner horizon, they will be stretched and torn apart by the immense tidal forces. The region between the inner and outer horizon is also where the black hole's strong gravitational effects can cause time and space to become distorted.

The study of the inner and outer horizon of black holes is important for understanding the nature of space, time, and gravity. It also has implications for our understanding of the universe and the role of black holes in the formation and evolution of galaxies.