Is time travel possible?
For most people “time travel” means traveling faster than 1 second per second.
Real-life time travel occurs through time dilation, a property of Einstein’s special relativity.
The faster you travel, the slower you experience time.
Scientists have shown that this theory is true. They used two clocks set to the exact same time. One clock stayed on Earth, while the other flew in an airplane going in the same direction Earth rotates. After the airplane flew around the world, scientists compared the two clocks. The clock on the fast-moving airplane was slightly behind the clock on the ground. So, the clock on the airplane was traveling slightly slower in time than 1 second per second.
In order to send a traveller years into the future, we would either have to take advantage of the intense gravitational acceleration caused by black holes or send the traveller rocketing into space at close to the speed of light (about 1 billion km/h).
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