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El_Sephiroth t1_jaqolh4 wrote

Reply to comment by Aseyhe in Could we enter a stable orbit of a black hole which enters the even horizon and comes back out? by Sol33t303

Found the answer online.

A Kerr black hole (one that rotates around its axis), has an ergosphere in which you can enter and get out because of the Lense-Thiring effect. Basically, the rotation of the black hole drags space-time and changes the frame of reference in which you move. Therefore if an object passes into the ergosphere it can still be ejected by gaining energy from the rotation.

But! If anything passes the event horizon, the surface limit where the escape velocity is the speed of light, then no material thing can escape.

It's on daviddarling.info.

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Aseyhe t1_jaqrsbp wrote

Right, the infalling object can't escape into our universe after it crosses the event horizon. In the idealized black hole construction, the infalling object will, however, escape into another universe (via a white hole) if it avoids hitting the singularity.

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