According to Einstein's general relativity, gravity warps time, causing time to pass more slowly in stronger gravitational fields; near a black hole's event horizon, one hour experienced by an observer could correspond to thousands of years passing elsewhere, meaning someone who ventures near a black hole and returns would find that everyone they knew has aged or died while they remained the same age.
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If You Stood Near A Black Hole And Came Back, Everyone You Know Would Be Dead.Added:
The ticking watch on your wrist is keeping a profound secret. Time isn't [music] a constant invisible river flowing perfectly through the universe.
It's more like a fabric.
And gravity [music] is what bends it. Imagine approaching the edge of a supermassive black hole.
Here, gravity is so intense it [music] physically stretches the space around you. As space stretches, time has to stretch right along with it.
>> [music] >> To you, inside the ship, the seconds tick by completely normally.
>> [music] >> But to someone watching from afar, you've nearly frozen in place. Every hour you spend orbiting this dark sphere [music] costs you years back home. The universe ages rapidly [music] outside your window, spinning into the future. You haven't built a time machine. You just found a heavier clock. [music] In the deepest shadows of space, time doesn't just pass, it waits. [music]
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