The boundary beyond which nothing, not even light, can escape a black hole is called:
AAccretion Disk
BEvent Horizon
CSingularity
DPhoton Sphere
Explanation
The event horizon is the outer threshold surrounding a black hole where gravitational pull is so strong that escape velocity exceeds light speed.
Exam Relevance
- Topic: Astronomy & Space Exploration
- Subtopic: Black Holes & Astrophysics

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