What Is Time Travel?
Fictional time travel allows characters to go back in time and alter events. This can be either a beneficial thing, or something to be avoided. Some stories allow time travelers to alter Real Life events while others make it impossible.
Altering the Past
In fictional time travel stories, characters often attempt to alter the past in order to solve a current problem. This could involve altering a past villain’s character, reversing technological advancements caused by conflict or even preventing an even grimmer future from occurring.
Some fictional stories involve travelling into the future, such as in “Back to the Future” where a time traveller returns to 1950s America only to witness his twin sister die from cancer – this phenomenon known as “time dilation,” which accounts for why her death occurred so quickly.
Another example of time dilation can be seen in the decay of muon particles, which typically take 2.2 microseconds to decay. But when cosmic rays strike the upper atmosphere and create muons that take 10 times longer to disintegrate, it creates muons with 10 times longer lifetimes.
Time travelers from the future may experience Earth as though they have just recently arrived, although in actuality they are slightly older than most people on the planet due to time dilation’s effect on perception. It appears as though they have been here for an extended period of time already.
A wormhole is a shortcut that allows time travelers to travel from one point in spacetime to another. But it comes with great risks.
Time travel is possible due to general relativity, which states that spacetime warps into closed time-like curves (CTCs). Unfortunately, any scheme utilizing CTCs must be physically consistent with the laws of physics in order for it to be feasible.
Many physicists consider this to be a problem, since the laws of physics are designed to prevent inconsistencies. Therefore, they could not guarantee that someone traveling through time would not accidentally alter an important moment in history (the grandfather paradox).
Unfortunately, scientific evidence does not yet support the concept of time travel. This is because there are numerous issues involved with traveling from one point in space to another within a specific timeline.
No proof has been provided that it’s possible. Furthermore, an intricate set of mathematical equations would need to explain how it occurs, making it incredibly complex for humans to comprehend what is occurring.
However, this concept has inspired numerous books, television shows and movies – mostly works of science fiction, but also popular culture.