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A cross section diagram of the maximal extension of the Kerr solution. The ergosphere – bounded by a stationary limit surface and the outer horizon of the black hole – appears as a light blue oval describing the region where no observer can remain stationary. A second interior horizon is a black circle smaller than the outer horizon, while the ring-like singularity appears from the side like a black line segment perpendicular to the dashed axis of rotation.

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A cross section diagram of the maximal extension of the Kerr solution. The ergosphere – bounded by a stationary limit surface and the outer horizon of the black hole – appears as a light blue oval describing the region where no observer can remain stationary. A second interior horizon is a black circle smaller than the outer horizon, while the ring-like singularity appears from the side like a black line segment perpendicular to the dashed axis of rotation.
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Robert McNees (mcnees@mastodon.social)'s status on Saturday, 16-Dec-2023 19:35:06 UTC Robert McNees
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But the most important development at the conference came when a young physicist named Roy Kerr presented his solution of the field equations of general relativity describing a rotating black hole.
This solution describes the exterior of essentially every black hole in the Universe.
Image 2: James, Tunzelmann, Franklin, and Thorne

In conversation about a year ago from mastodon.social permalink