why time is slow reaching black hole
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It is due to the high gravity of black hole
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Originally Answered: If time goes faster on Earth, why does time go slower in a black hole?
Time on the Earth’s surface passes more slowly than in space. (Time may be passing faster on the Earth than on orbiting spacecraft, but that has to do with the high orbital velocity of the spacecraft and special relativity, not with the gravitational field of the Earth.)
The same gravitational time dilation that causes Earth clocks to tick ever so slightly slower than clocks in space also brings clocks to an apparent halt as they approach the event horizon of a black hole.
It is not meaningful to compare clocks inside the event horizon of a black hole and outside. This is the geometry of extreme relativity. To an outside observer, the formation of the event horizon itself is forever in the future. To an observer who crosses the horizon, the horizon becomes a past moment in time, not a place that can be reached; effectively, the time coordinate and the radial coordinate swap places, and time now progresses from the horizon to the singularity (which is now a future moment in time).
Time on the Earth’s surface passes more slowly than in space. (Time may be passing faster on the Earth than on orbiting spacecraft, but that has to do with the high orbital velocity of the spacecraft and special relativity, not with the gravitational field of the Earth.)
The same gravitational time dilation that causes Earth clocks to tick ever so slightly slower than clocks in space also brings clocks to an apparent halt as they approach the event horizon of a black hole.
It is not meaningful to compare clocks inside the event horizon of a black hole and outside. This is the geometry of extreme relativity. To an outside observer, the formation of the event horizon itself is forever in the future. To an observer who crosses the horizon, the horizon becomes a past moment in time, not a place that can be reached; effectively, the time coordinate and the radial coordinate swap places, and time now progresses from the horizon to the singularity (which is now a future moment in time).
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