Astronauts living on the International Space Station are moving faster than the people on Earth. This means that astronauts age slightly slower in space than they would back home. One example of a time traveler was cosmonaut Gennady Padalka, who arrived back on Earth in September after breaking the record for the longest stay in space at days.
Meanwhile, a real time machine has also already been built. It does not look anything like a DeLorean, but it is actually rather popular in the field of science, namely the Large Hadron Collider. The Large Hadron Collider propels proton at nearly the speed of light, which is a speed that makes the relative time of the protons move around 6, times slower compared to human observers.
In essence, the protons are being sent into the future. Astronauts and subatomic particles being sent a fraction of a second into the future, however, is far from the end goal of time travel. The mission, of course, would be to transport humans through the fabrics of time. This is the place to ask them. Nobody will laugh at you here.
Want more Popular Mechanics? Get Instant Access! Type keyword s to search. Today's Top Stories. Xuanyu Han Getty Images. Einstein also said our universe has a speed limit: nothing can travel faster than the speed of light , miles per second. Einstein's theory of relativity says that space and time are linked together. What does this mean for time travel?
Well, according to this theory, the faster you travel, the slower you experience time. Scientists have done some experiments to show that this is true. For example, there was an experiment that 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.
We can't use a time machine to travel hundreds of years into the past or future. That kind of time travel only happens in books and movies. But the math of time travel does affect the things we use every day. For example, we use GPS satellites to help us figure out how to get to new places. Check out our video about how GPS satellites work. But did you know that GPS relies on time-travel calculations to help you get around town?
GPS satellites orbit around Earth very quickly at about 8, miles 14, kilometers per hour. This slows down GPS satellite clocks by a small fraction of a second similar to the airplane example above. GPS satellites orbit around Earth at about 8, miles 14, kilometers per hour.
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