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Roy Kerr argued that these objects do not necessarily contain certain types of singularities in a possibly flawed 2023 arxiv ("archive") preprint. For 10 points each:
[10e] Kerr names a solution to the Einstein field equations describing a neutral, rotating one of these objects, which are described by the Schwarzschild metric when stationary.
ANSWER: black holes [accept Kerr black holes, accept Schwartzchild black holes]
[10m] Kerr black holes can spin down via the Penrose process when matter enters this region. In this region, frame-dragging causes the time component of the metric to become positive.
ANSWER: ergosphere
[10h] Due to extreme frame-dragging, a particle's trajectory inside the ergosphere must have this property when viewed by an outside observer. This property can lead to particles with “negative energy,” thus driving the Penrose process.
ANSWER: corotating [or moving in the azimuthal direction; or descriptions of it orbiting in the same direction as the black hole's spin; or descriptions of its angular momentum or angular velocity being aligned with or pointing in the same direction as that of the black hole; prompt on descriptions of the particle moving or accelerating or not appearing stationary to an outside observer]
<Science - Physics>

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Data

I wish it were possible to freeze time so I would never have to watch you retireAw we're so sorry to hear that maman died today, she gets five big booms100010
CLEVELAND, THIS IS FOR YOU!UBC1010020
throw away your cards, rally in the streetsThompson et al.100010