According to current scientific understanding, if time travel were possible, it likely wouldn’t “break” the universe in the sense of causing a catastrophic event, but instead, might create alternate timelines where changes to the past wouldn’t affect our present timeline, essentially creating a “parallel universe” with a different history; this is often referred to as the “many-worlds interpretation” in quantum mechanics. 

Key points about time travel and the universe: 

• No evidence for time travel:Despite theoretical possibilities, there’s currently no concrete evidence or technology that allows for time travel, particularly to the past, as it would violate the causality principle (cause-and-effect). 
• Einstein’s theory of relativity:This theory suggests that time is relative and can be “bent” by gravity, which could theoretically allow for time dilation (experiencing time differently depending on your speed or gravitational field) – but not necessarily full-fledged time travel. 
• The “grandfather paradox”:A common thought experiment where traveling to the past and preventing your grandfather’s birth creates a paradox, which is why many scientists believe that if time travel is possible, it would likely only allow for travel to a future timeline where your actions wouldn’t affect your present. 
• “Chronology protection conjecture”:Physicist Stephen Hawking proposed that the universe might have mechanisms to prevent time travel paradoxes from occurring, essentially protecting the timeline. 

Potential ways time travel might not break the universe: 

• Alternate timelines:If you travel to the past, your actions might not change the current timeline, but instead create a new, parallel timeline with different events. 
• Limited interaction:Even if time travel is possible, it might only allow for observation of the past without the ability to directly interact with it, preventing significant changes. 

The question of whether time travel would “break the universe” is a fascinating one and has been a topic of debate among physicists, philosophers, and science fiction writers. Here are some key points to consider:

1. Theoretical Frameworks

• General Relativity: According to Einstein’s theory of general relativity, time is intertwined with space, forming a four-dimensional spacetime. Certain solutions to the equations of general relativity, such as closed timelike curves (CTCs), suggest that time travel could be theoretically possible.
• Wormholes: Some theories propose that wormholes could allow for shortcuts through spacetime, potentially enabling time travel.

Multiverse Theory

• Some interpretations of time travel propose that instead of altering the original timeline, traveling back in time might create a new, branching timeline or alternate universe. This could avoid paradoxes but complicates the concept of a single, cohesive universe.

4. Practical Considerations

• Energy Requirements: The energy required to create and stabilize a wormhole or to manipulate spacetime is currently beyond our technological capabilities.
• Quantum Mechanics: Quantum theories introduce additional complexities, such as the role of observers and the uncertainty principle, which may influence the feasibility of time travel

Conclusion

While time travel presents intriguing theoretical possibilities, it also raises significant philosophical and scientific challenges. Whether it would “break the universe” depends largely on the framework you adopt and how time travel is conceptualized. As of now, time travel remains a speculative concept, with no empirical evidence supporting its feasibility.

Is it possible that someone has already invented time travel, figured how dangerous it was and destroyed their time machine?

Yes.
Not only is it possible, it has actually already happened.

The person who invented the time machine was Xepsis Klerglemoss, and this is what it looked like from photos he left behind:

The machine itself did not actually go anywhere, it simply – in effect – vaporised the time traveler, and then unvaporised them in the appropriate time period. The machine could be controlled from wherever he was.

From his diary notes we find that his first attempt was just to go back a year.
The machine worked perfectly, except it only vaporised him but not his clothes, so he arrived naked except for metal objects.
And it happened that his workshop had previously been a Victorian drapery, and was full of ladies at the time of his arrival.

Luckily he was able to vaporise himself quickly, but not before he was snapped by a photographer taking pictures of the shop’s sales day

This picture of him was used by the police in their hunt for the strange intruder.
The unfortunate consequence of the incident was that the Draper’s shop was boycotted by ladies thereafter, and had to close down.
Some newspapers claimed that the shop had deliberately staged this event as it was trying to promote its special protective clothing for ladies.

Mr Klerglemoss realized that going back in time had unintended consequences, and that his workshop was the consequence of his own action, as the drapers became bankrupt due to his action, and he had himself bought the premises cheaply for his experiments.

It poses a rather complex paradox, and resulted in his deciding to abandon Time travel, and to destroy his equipment.
His story is only known by a chance event in that he was in the process of moving to a new house, but had lost his keys. He decided to time travel back to the morning when he last had his keys, which he did, and found them.
But on traveling back to the present time, the Moving men had shifted his wardrobe, and unluckily he arrived back in his locked wardrobe. He had dropped his ‘Vaporiser’ but there was not enough room for him to bend down and pick it up.
The result was that he was discovered some time later, dead, and naked in his wardrobe, with no explanation of how he got there.
It was reported in the local paper, and a journalist, out of curiosity, discovered what appears to be the above story, though his version of it was dismissed by the police.

We might never know the full truth of the matter, but there is a lesson to be learned about tampering with Nature.

John titor, a man from 2036

In November 2000, a man named John Titor started answering questions, on the internet, about time-travel.

The man claimed that he is from 2036 and said that their world was torn apart because of the war between the US and Russia. Only a few people survived.

Now, he had come back into the past to retrieve some items that would help them rebuild society.

He specifically asked for a computer—IBM 5100—which was never released to the public and known by only people who designed it.

He was all over the internet for 4 months and then disappeared

The mysterious streets of Liverpool

There are so many time travel stories about Liverpool, and I am sharing this one—

In 2011, a woman went to a Mothercare store to buy a gift for her sister. While checking out, her credit card was turned down.

She went back home and complained to her mother.

And when they both returned to the place, there was no Mothercare store—It was a bank

The man from a country that never existed.

( This is my favorite one )

In July 1954, a man came to Tokyo Internation Airport. On the check-in counter, when he gave his passport to be stamped, something strange happened.

The country that issued the passport was Taured—a country that never existed.

While interrogation, the man told that the country existed between France and Spain. The man knew many languages as well.

And later, he disappeared, mysteriously.

The story became so popular that a novel was written, a few years later.

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