2. Time travel via gravity
The next method of time travel is also inspired by Einstein. According to his theory of general relativity, the stronger the gravity you feel, the slower time moves.
As you get closer to the centre of the Earth, for example, the strength of gravity increases. Time runs slower for your feet than your head.
In 2010, physicists at the US National Institute of Standards and Technology (NIST) placed two atomic clocks on shelves, one 33 centimetres above the other, and measured the difference in their rate of ticking. The lower one ticked slower because it feels a slightly stronger gravity.
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Absolute time does not exist
Time moves slower the closer you are to Earth. In his theory of general relativity, Einstein explained that the gravity of a large mass, like Earth, distorts the space and time around it.
In 2010, researchers placed two precise atomic clocks, one 33 centimetres higher than...
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