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Why Time Stops at a Black Hole — Explained

Time doesn’t really “stop” inside a black hole — it just appears to from the outside. Here’s why:

According to Einstein’s General Theory of Relativity, gravity isn’t a force pulling you in — it’s the curvature of spacetime itself. The stronger the gravity, the more spacetime bends.

Now, a black hole is the most extreme curvature possible. Its gravity is so intense that even light can’t escape once it crosses a certain boundary — called the event horizon.

To an outside observer, when an object approaches the event horizon:

The gravitational field becomes infinitely strong.

Time dilation occurs — time for the falling object slows relative to the observer’s time.

Light emitted from it gets more and more redshifted (stretched to lower energy).

Eventually, it appears to freeze at the horizon, fading away slowly.


But for the object falling in, it experiences nothing special at the horizon — it continues to move normally and reaches the singularity in finite time (milliseconds or seconds depending on mass).

So in short:
🕰️ From outside: Time appears to stop at the event horizon.
⚫ From inside: Time flows normally, but spacetime ends at the singularity — beyond which time itself ceases to have meaning.

This is why physicists say time “stops” at a black hole — it’s not frozen universally, but from our perspective, the curvature of spacetime makes it look like the end of time.
#space #physics #blackhole #spacetime