Multiple choice general knowledge science & technology

Rotating black holes are surrounded by a region of spacetime in which it is impossible to stand still, known as __.

  1. photon sphere

  2. ergosphere

  3. event horizon

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ergosphere is a region outside the event horizon of a rotating black hole where frame-dragging is so strong that objects cannot remain stationary. The photon sphere is where photons can orbit. The event horizon is the point of no return.

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