Questions tagged [time-travel]

For questions relating to travel in time. Such travel often involves FTL travel; consider also using the [tag:faster-than-light] tag.

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4
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1answer
276 views

Time travel to the mid-1980's - how do you sneak into society and make a ton of money as fast as possible? [closed]

The scenario: You are from the distant future, and are trapped in a parallel universe in the mid-1980's. You cannot expose your true identity and your only resource is a hidden laboratory where you ...
3
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5answers
339 views

The Paradox Men - Cosmology

In Charles L Harness's 'The Paradox Men', a spaceship crashes on earth several years before it launches, having circumnavigated the universe faster than the speed of light. It is a good read, but I ...
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2answers
209 views

How would age change when crossing into an alternate universe? [closed]

For a project I'm working on, a pair of "immortal" characters end up crossing from their dimension (a fantasy world) into what could be described as the "real" world, and I'm considering aging them ...
5
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2answers
164 views

Is there any way to build a world with science-compliable time travel without disproving the Theory of Relativity?

I want to make a world similar to ours, with one additional feature: Time travel. There is no difference to me if its loop-based or infinite universe based. But there is a catch: The theory of ...
5
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3answers
172 views

Time travel parental DNA shenanigans

If you and your significant other traveled back in time 50 years, had a child (who gets citizenship of the fictional country in question due to being born there) and left the child with a trusted ...
0
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1answer
143 views

What happen to gravity if time is suddenly running backward? [closed]

From my naive understanding of Einstein theory of relativity: gravity is not a force but only a consequence of inertia in a world where mass deforms the space-time. Without time, no gravity is ...
5
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4answers
572 views

Would ancient people understand “I'm from the future?”

Time travel is a major staple is sci-fi. You just can't escape it. Sometimes the characters travel so far back, that if or when they tell locals that they are from the future, I'm skeptical that the ...
4
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5answers
312 views

What would a person want from the past version of himself? [closed]

Imagine a world, where technology allows to summon yourself from the past to your own body. Conditions: you can only transfer consciousness from the past and back, no body, no things; you are not ...
6
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2answers
322 views

Einstein-Rosen Bridge Worldgate time-gravity travel issue

In this mostly hard-science universe I am using a theoretical "Hyperstable Gateway" to travel between planet X and Y; The wormhole has a ~5m diameter, The "Bridge" itself is negligible and a physical ...
2
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5answers
371 views

What items can I trade for supplies in the 17th century?

A trio of characters are stuck in the past (1691, Salem), without any supplies, except for the clothes they are wearing and the items they have in their pockets. They don’t have any food, and their ...
73
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12answers
22k views

How would people in 17th century Salem react to modern day clothing

So I and two others are working on a time machine, and I accidentally press a wrong button and whoosh, all my friends and I are in 17th century Salem, Massachusetts. Nobody sees us appearing out of ...
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8answers
1k views

How to prove you're a time traveller from the (far) past

(Almost like this post but not quite the same - I've seen multiple how to prove you're from the far future but not one how to prove you're from the far past so figured it could be fun to think of a ...
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4answers
224 views

What could be a possible way to avoid the effects of time travel on the traveller? [closed]

Let me explain... you have a time traveler from the year 10,000. The traveler has a device that has all of recorded history up until 10,000 a.d. in it, like a text book to be read. If that traveler ...
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11answers
11k views

Would time travelling to the present be lethal to a person from the 1200s?

John Smith is a time traveller from the year 2018, he goes back in time to the year 1200 and in the process falls in love with a woman of that era. He doesn't want to abandon her so he decides to ...
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6answers
570 views

(Please Someone Explain) Is time travel using wormhole as portals possible logically?

I am working on a story and came up with a doubt regarding an explanation given for time travel using wormholes as portals. The below given is taken from Wikipedia link: https://en.m.wikipedia.org/...
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4answers
346 views

How broken would my jPhone be if I traveled back in time 24 hours?

I have a character who ends up jumping backwards in time by 24 hours. Essentially nothing else changes, but the character has their jPhone in their pocket at the time of the jump. How functional ...
1
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2answers
133 views

What reading material from the current day could revolutionize the past? [closed]

Basic Premise The story of a person going back in time, bringing with them material from the future is one that dates back at least as far as 1838. Sometimes, the character brings a boomstick. Other ...
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3answers
146 views

What mystery of history to solve first? [closed]

Let us assume humanity, in the near future, acquires the technology to look and listen into the past without being able to change any of it, but it is very complicated and even more expensive, so, for ...
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3answers
300 views

The Transferable Skills of Sociopathy

Executive Summary Thank you for considering Chronograph Talent Consulting for your talent acquisition needs. We select the best talent from all previous periods of human history and make them ...
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3answers
329 views

Which modern technologies can I use to pass myself off as a God / Demi-god in the medieval era? [closed]

Alex has a time machine. Alex wants to be revered as a god, change human history and make everyone worship him as the reincarnation of said god. I decide to be a god of war and conquer a big part of ...
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4answers
267 views

If I travel through a worm hole some massive distance, lets say 6 billion light years, have I traveled in time? [closed]

I'm writing a sci-fi novel and I want it to be well founded in science but I'm a bit confused about time travel vs distance travel. Some have said that to travel great distances is really time travel. ...
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10answers
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How do I manage memetic infection while time traveling?

Time travel works...just invented, by you. The tests prove it! After many conversations and significant planning, your epidemiologist significant other has approved your plans for time travel, ...
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2answers
213 views

Effects of an uninvolved time traveller [closed]

This is part one of two related questions. Let us suppose that we have an expert in a a particular period of time, a person who is one of the world's foremost experts on the period. This person also ...
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1answer
115 views

Time travel wars [closed]

I am wondering how futuristic wars would play out if time travel was an available technology, sort of like the Time War in Doctor Who. assuming a galactic war where both sides are fairly evenly ...
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4answers
129 views

Motives for preventing a generation ship from reaching its destination - but not destroy it [closed]

The home planet of a race is completely annihilated (hit by another planet or something), but they managed to launch a generation ship beforehand, and a few thousand people go on a century-long trip ...
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3answers
3k views

What is the probability of two people having two identical scars? [closed]

What is the probability of two people having the same scar on their body in the same spot and the same shape and the same backstory (drunk driver in a chevy '78) Could the scar be a viable form of ...
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5answers
210 views

What can I offer to talented people if I can't allow them to have anything? [closed]

In your not-so-distant future of the 25th century humanity finally found a solution to one of the biggest problems: can we travel back through time? Actually, yes we can. However, there is a big BUT: ...
3
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6answers
316 views

What knowledge or occupation today would be most useful if time-travelling back to the Middle Ages? [closed]

Note: I'm new to this site, and I'm aware that the rules say it's better to ask questions that can answered, not just discussed, so if it is better I could phrase my question this way instead: "Are ...
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5answers
308 views

Criminal law and backward time travel

Alright, this might sound pretty convoluted, but I would truly value an expert eye to help me with a very theoretical situation. I've been working on a science fiction novel where the whole world ...
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15answers
5k views

How to tell someone they have travelled in time, by gesturing?

Two strangers, Alice and Daisuke, are from two different cultures and speak different languages. Oh, and they are from two different times! Alice, was unwillingly, unknowingly and unexpectedly ...
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4answers
117 views

Legal consequences of duplicated and “resurrected” people in a Temporal shift [closed]

A plane goes trough some kind of atmospheric disturbance and ends up badly damaged, crashing after trying an emergency landing. Of 200 passengers onboard, only 80 survive, some of them badly injured (...
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6answers
262 views

A time travelers impact on history [closed]

Suppose a person from our time is somehow (unintentionally) transferred to Western Europe during the late Middle Ages (circa 1300-1400). In a universe that allows multiple timelines, natural or ...
2
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3answers
292 views

Faster time for humans compared to (more advanced) intergalactic civilizations

This is my first post, I apologize in advance if my English is not accurate, it is not my first language. My question is: in a world where very advanced civilizations have achieved intergalactic ...
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7answers
1k views

If a character travels back in time … is their demise within reason?

If a character - or a bunch of them - travel back in time to undo a chain of events that would have led to their conception and births, is it within reason that I have them die or 'fade from existence'...
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8answers
2k views

Time Traveller's Problem: Is This a Stable Loop? [closed]

I come from Europe, year 2017. One day, I fell through time to 1317. I have no idea how that happened. There must have been some kind of invisible one-way "rabbit hole" in my attic. So here I am, in ...
0
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1answer
298 views

“Time travel” and temperature/energy [closed]

I'm sure people have heard many times of faster forward time-travel, likely involving speed and or gravity, bending the fabric of space-time. But what I would like to know, is if it is realistic to ...
15
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9answers
1k views

Can a modern book that traveled back in time be proven to be older?

Imagine I travel back in time ~500 years, leave a modern ship/boat log book in a cave and the log book was discovered today. Since the book was discovered after it was possible to buy it off the shelf ...
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6answers
207 views

What techniques can be used to mitigate obstruction impact during time-travel?

In the future, when an object emerges in a different time, that moment is referred to as a crowning. An impacted crowning is when said object materializes within another object, fusing with it. An ...
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6answers
377 views

Is there any feasible real sounding science sci-fi explanation for a chronovisor?

What would be able to explain a visor like device that can see the past or future? I'm trying to make it as little as clarketech as possible. Any ideas?
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4answers
211 views

Is there any Rubber/Latex source that could have been used by Europeans prior to the discovery of the Americas?

I was imagining a scenario where an 21st century engineer accidentally finds himself transported through time to early Renaissance Europe. Realizing that no help or rescue is on the way, he decides to ...
3
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2answers
316 views

Obtaining past winning lottery numbers [closed]

For a science fiction story involving time travel, where the protagonists can go back exactly 33 years from 2013 to 1980, and are looking for a way to make a lot of money quickly: Is there any way ...
6
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3answers
1k views

Can time move faster on another world

What is a plausible way for a planet to have time pass 10× faster than another? Seen the movie Interstellar? That one planet that time ran slower on? It the same idea but the other way around. Is ...
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6answers
206 views

Alternatives to time travel [closed]

Little thought experiment. #GeDANKen A man wishes to travel through time to save the love of his life. Only, he can't. While he can't revisit the past, he discovers a way he might be able to change ...
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3answers
4k views

If a person does not age can their hair and nails still grow?

In my story, those who are transported back in time do not age if they have to live through the years in the past. You don't start aging again until you reach the point in time you left. I was ...
20
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8answers
2k views

How to figure out someone is plagiarizing the future? [closed]

In my story, there is a character who can go back in time, and has done so already, for the purpose of getting rich. He is not the main antagonist, neither is he the main character. He is mostly just ...
20
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16answers
3k views

How to not get caught milking the stock market with a time machine

Suppose I have a machine that lets me see the near future, and I want to use this to get rich on the stock market. What is the best way to invest so that no one suspects that I'm doing something ...
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6answers
299 views

Prolonging life through vibrating near light speed?

Inspired by this question. Suppose we can get a container strong enough to withstand the force needed for the vibration, and the human or clock within is able to survive the duration of the ...
2
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3answers
417 views

How would you build a castle if you went back to medieval ages with current technology — within limits? [closed]

Suppose you are going on a trip back to 1300 Western Europe. You can take supplies with you and a contingent of people to help run things. You can only travel once and your goal is to stay for the ...
11
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4answers
829 views

Time travel and random events

Suppose we have a Branching Timeline paradigm, in which time travel into the past creates a new timeline. Is it fair to assume that any probabalistic events which might occur might be very different ...
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2answers
188 views

Could a modern man live in the past not to betray himself? [closed]

Could a modern man live in the past and not betray himself? How important would immunity, appearance, language, etc. be? What problems would a person from the distant past experience in our world?