Podbit · The Diary Of A CEO with Steven Bartlett
A black hole isn't mysterious magic — it's any object where the escape velocity equals the speed of light, so nothing, not even light, can get out. The moment you cross the event horizon, there is no path in any direction that leads back out.
Where this was said
At 38:49 · chapter starts 37:03
Tyson begins with a concept 10-year-olds can grasp — escape velocity — and builds systematically to the full horror of black holes. [1] — Neil deGrasse Tyson "Falling into a black hole, you'd watch the entire future history of the universe unfold in fast-forward due to time dilation. Then tidal fo…" 42:40 Earth's escape velocity is 7 miles per second; a black hole is simply any object where that threshold equals the speed of light. Cross the event horizon and there is no path in any direction that leads out — spacetime itself is folded back on itself. Inside, time dilation means the universe's future unfolds in fast-forward around you. Then come the tidal forces: the difference in gravity between your head and feet grows catastrophically. You are stretched, then snap at the base of your spine into two pieces — and you keep falling, bifurcating 1 to 2 to 4 to 8 all the way to the singularity. Simultaneously, you're being compressed laterally and extruded through the fabric of spacetime 'like toothpaste through a tube.' At the singularity itself, general relativity predicts infinite density and infinite smallness — a point where the equations themselves break down. Tyson closes by noting that general relativity actually predicts an entirely new spacetime opening up inside the black hole — a whole universe of its own.
Earth's escape velocity is 7 miles per second; a black hole is an object where that threshold equals the speed of light, preventing anything — including light — from escaping.
Falling into a black hole, you'd watch the entire future history of the universe unfold in fast-forward due to time dilation. Then tidal forces would stretch and snap you into two pieces, then four, then eight, all the way to the singularity — while simultaneously extruding you like toothpaste through the fabric of spacetime.
Tidal forces inside a black hole stretch a human body head-to-toe, then snap it into pieces — bifurcating 1 to 2 to 4 to 8 — while simultaneously extruding them through spacetime like toothpaste through a tube.
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