From Bill and Ted, to Marty McFly and those guys in the hot tub, time travel seems to belong in the world of science fiction. But there are some time travel theories that may change that thought.
To be clear, regardless of what you see in the movies or on TV, not all scientists believe that time travel is possible. Some even say that an attempt would be fatal to a human.
So lets start with a video featuring 10 mind-bending theories about time travel. From there, we’ve dug up some scientists with other opinions on the matter.
WATCH: Time Travel Theories
As we said above, not all scientists believe that time travel is possible. But how would it be fatal to a human?
It’s confusing, no doubt. And here’s how NASA explained it on their kid’s page (which, honestly, makes it understandable for our discussion). They reveal that Albert Einstein came up with an idea about how time works, and that our universe has a speed limit: nothing can travel faster than the speed of light (186,000 miles per second).
From there, they explain this:
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.
Bottom line? Time travel is a real thing, but it’s not quite like the movies. In theory it’s possible, but more research is needed.