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Black Holes and Astrophysics Quiz
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A boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole and not outward is known as ___.
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A
event horizon
💡 Explanation:
The event horizon is the boundary marking the point of no return around a black hole - beyond this boundary, nothing, not even light, can escape the black hole's gravitational pull. It's a one-way membrane in spacetime where all future-directed paths lead inward toward the singularity. The other options ('black boundary', 'loop horizon', 'gravity boundary') are not standard physics terminology.