USA TODAY's Daryl Perry

5:00 PM on September 10, 20223 minutes to read

Time travel is a popular concept in science fiction media. In his essay "The Paradoxes of Time Travel," the late philosopher David Lewis characterised it as "[involving] a contradiction between time and space time. Any traveller sets off and then arrives at his or her destination; the distance travelled is the amount of time between departure and arrival.

Most people typically think of time travel as going back in time or forward to a future location. However, how much of the concept is grounded in reality? Is it possible to go back in time?

NASA claims that time travel is feasible, but not in the manner you may anticipate. According to Albert Einstein's theory of relativity, time and motion are relative to one another and that the speed of light, which is 186,000 miles per second, is the maximum possible velocity. "Time dilation" is the mechanism that allows for time travel.

According to Live Science, time dilation is the process by which one person's sense of time differs from another's based on their movements or location. Time is therefore relative.

Time travel is a possibility, and Dr. Ana Alonso-Serrano, a postdoctoral researcher at the Max Planck Institute for Gravitational Physics in Germany, discussed how hypotheses are tested.

According to Alonso-Serrano, space and time are not absolute concepts. The fact that you can carve spacetime only adds to the complexity of the situation.


According to Albert Einstein's theory of relativity, time and motion are relative to one another and that the speed of light, 186,000 miles per second, is the maximum possible velocity.


Alonso-Serrano told USA TODAY that when you slice spacetime, you may experiment with that curvature to make time flow in a circle and create a time machine.

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She described how time travel is hypothetically feasible. Although the mathematics underlying the curvature of spacetime are sound, it can be difficult to reproduce the exact physical circumstances required to support these theories.

The tricky part of it, according to her, is figuring out a practical, physical means to accomplish it.

Wormholes and warp drives, according to Alonso-Serrano, are the means employed to produce this curvature. Exotic matter is required to successfully curtail spacetime via a wormhole, but this hasn't been done yet. Even the existence of this kind of stuff is unknown to researchers, she claimed.

We work on it because it's theoretically feasible and because testing it out is a great method to find any contradictions that might exist. Added Alonso-Serrano

Alonso-Serrano is unsure of any further ways to travel across time besides those already listed.

Although I couldn't say it, she said, "I cannot dismiss the possibility."

She also brought up Stephen Hawking's champagne celebration for time travellers, where Hawking had designated a GPS location for the event. To ensure that only those who could time travel could attend, he didn't send out invitations until after the party had actually taken place. Hawking described this incident as "experimental evidence" that time travel wasn't conceivable because no one showed up.