Question

What does mean by space- time singularity?

Answer 1

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In the center of a black hole is a gravitational singularity, a one-dimensional point which contains a huge mass in an infinitely small space, where density and gravity become infinite and space-time curves infinitely, and where the laws of physics as we know them cease to operate.

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Answer 2

A spacetime singularity is a breakdown in spacetime, either in its geometry or in some other basic physical structure.

It is a topic of ongoing physical and philosophical research to clarify both the nature and significance of such pathologies.

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