Regarding travel forwards or backwards in time, outside of normal temporal constraints, and the implications and repercussions thereof.

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Time travel theory without paradoxes? [on hold]

Is there an explained time travel theory that has no paradoxes? What I mean is that it's basically impossible to kill your own parent. No matter how much you try and even if you succeed, the time ...
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3answers
147 views

Why did nobody else need a Time Turner?

In The Prisoner of Azkaban, Hermione forgets to go to Charms after going to whatever other class she has that day--Muggle Studies, Runes, or maybe Arithmancy. Whatever class it is that is always the ...
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41 views

Doesn't Legends of Tomorrow cause a Time paradox?

If Legends of tomorrow heroes reach their goal and kill "Savage" wouldn't that be a "Time paradox"
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1answer
68 views

How did the colonists know they wouldn't affect their future?

I'm a little confused. How did the people in the past in Terra Nova know they weren't going to alter the future of human race? Or, is it not their past but a whole new planet they colonized?
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1answer
114 views

Story by Stanislaw Lem about time travel

I recall reading a story by (I think) Stanislaw Lem, about time travel. It was humorous and lightly absurdist, and included an explanation of witches' broomsticks, which he explained as being ...
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1answer
126 views

How could Edith Keeler have been hit by a car if she wasn't there?

This question may look confusing, but it's really pretty simple. In the Star Trek episode "City on the Edge of Forever," there are three timelines. In one, Edith Keeler is hit by a car while ...
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2answers
717 views

Voyager Time Space Continuum Problem?

In the episode of Voyager's "The Fight" that aired on March 24th 1999 The Doctor says that Chakotay has chronic traumatic encephalopathy. According to everything I have read, Dr. Bennet Omalu first ...
2
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1answer
89 views

Does the Flash ever meet his younger self in the TV show, after having gone back in time?

In The Flash (the 2014 TV-series), we see the Flash going back in time in "Out of Time" (S1E15) while solving the tsunami issue. But we didn't see him going back to the future. So we can assume he ...
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1answer
751 views

Time Travel Not Far Enough [duplicate]

A sci fi anthology had a short story about a time traveler who invented a machine that may have caused a catastrophic event by its use. The traveler from the future showed up to the front porch of ...
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83 views

I'm trying to find a book about three siblings that travel through time

The book I'm trying to find is a graphic novel I read when I was younger that featured three siblings that kept ending up in an old man's shop and would end up traveling to a random point in time ...
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1answer
105 views

Title/author of a short story about time travel/teleportation, ethics, death, washed out bridge

Likely I read this story in OMNI Magazine or Isaac Asimov magazine in high school (1981-1985). I remember it involved people either travelling through time or teleporting but ethically they were not ...
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3answers
170 views

Story about a time traveller who became their own mother and father [duplicate]

I once read about a story in which, by a series of unlikely manoeuvres of time travel and a sex change operation, one person (originally a girl) managed to be her own mother and father. IIRC, she was ...
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1answer
126 views

What are the known instances of the Doctor's *personal* history being rewritten?

The Doctor says he can't go back on his own timeline (for example, Smith and Jones, "except for cheap tricks"). It's implied it's a very bad thing to mess with his timeline. What are the instances of ...
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1answer
62 views

Book where 'others' are clones from the future sent back to gain ability to reproduce

During the story, strange things keep happening like alien kidnappings or other events. The nature of the 'others' isn't revealed until towards the end. I remember a question by a protagonist to the ...
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1answer
158 views

Why Voyager required assistance to travel back in time in the end of “Future's End” episode?

This answer to my previous question made me thinking -- why Voyager wasn't able to travel back in time, in the end of "Future's End" episode, without assistance of Capt. Braxton's ship / 29th century ...
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8answers
4k views

Does the Federation's 24th century technology allow time travelling?

Is it possible to travel in time, by technological and planned meaning? Or does it happens across all the episodes purely as an effect of some coincidence, defect, error etc. I know (from one of ...
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1answer
285 views

A book about a mediocre games developer that goes back in time?

This book has popped into my head and I'm desperately trying to remember what it is. This book must be from the 80s or early 90s - about a games developer who is pretty average and makes 'ok' games. ...
2
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1answer
126 views

How can the TARDIS be late?

I was reading this question about the Doctor Who episode "The Time of the Doctor", and I had a case of Fridge Logic trope. How can a time machine be late ? In this case it took the TARDIS 300 ...
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2answers
151 views

Did Edith Keeler really have to *die*?

In the Star Trek TOS episode 28, "The City on the Edge of Forever", we find that McCoy's drug-fueled tear through the past caused serious and far-reaching effects on the space-time continuum; to wit, ...
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1answer
112 views

Gloomy children's book involving time travel and a grandfather clock

I read this book when I was younger (before 2010). I don't really remember much of the plot or title or anything, but I have this recurring picture and feeling about it and I really want to know what ...
7
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1answer
168 views

Looking for a short story with time-loop plot

I remember the plot as follows: a guy is almost done building time-machine, then on some day he sees his girlfriend die in an accident, so he rushes to the machine and sends himself couple of hours to ...
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0answers
20 views

Where does the witch end up at the end of Seconds?

At the end of Seconds, Katie is trapped in a dead, empty world* with the witch. Katie says, "...you aren't alone. I'm here now. I'm in this world with you! ... we can still at least try to make it a ...
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2answers
2k views

Looking for a sci-fi book from the 1960s-70s about moving objects to change the course of history

The plot was that people from the future did extensive research and then made one small change to the past (like moving an object from one side of a room to another) that resulted in a major shift in ...
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1answer
202 views

How many times has the Doctor been to “the end of the universe”?

In the Doctor Who series, going to the very end of the universe is one of those things that was breathtakingly awesome the first time it was done but has finally become almost boring in its tropiness. ...
5
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1answer
177 views

Movie about a boy who accidently went back in time and ends up on a battle field

The movie was about a boy who accidentally travels back in time. He ends up on a field during a war. He also meets a girl about the same age; I think they were 10-12 years old. I forget the middle of ...
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1answer
137 views

What is the most distant future time period in science fiction? [closed]

Parameters: 0. It must be a finite time period from the beginning of the Universe, (like 1 billion years) 1. It must have some relevance to the story or plot 2. It cannot be open ended, 'end of the ...
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1answer
202 views

Modern military jet goes back to World War I

Looking for title and author of a short story. A pilot of an (American?) near-future military jet and his machine find themselves back in time on an airfield near the front line in World War I. The ...
8
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2answers
269 views

Who came up with the name Melody Pond?

On season 9 episode 4 (Before the Flood) of Doctor Who, The Doctor talks about the bootstrap paradox: So there's this man. He has a time machine. Up and down history he goes, zip zip zip zip zip, ...
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1answer
1k views

What's the name of the short story in which a man walks home from the future?

Man gets sent to the future. Walks back. His arrival at departure time causes huge blast that changes the world into what we see in snapshots of the surroundings at each step he takes trying to return ...
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1answer
116 views

Changing the past in zelda game “Skyward Sword”

In "The Legend of Zelda - Skyward Sword" you can use the timeshift stones or orbs to get yourself into the past. If you change things there, like opening a gate etc., this change is still there when ...
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0answers
155 views

Child tries to time travel to save parents but ends up in endless loop

I'm looking for a sci-fi book I read a while ago. I have the impression it was reasonably old. Anyway, so the opening sequence is a crying child refusing to get on a spacecraft and his Mum and Dad get ...
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3answers
262 views

What's the solution of Bootstrap Paradox without the involvement of multiple timelines?

In Doctor Who, there's no concept of multiple timelines. I remember The Doctor seeing himself after travelling back in time (viz. when Rose saved her father and in the recent episode Before The ...
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1answer
298 views

What “time travel” story required the traveller to mentally reconstruct his world in order to return to it?

Here's what I remember about it: The protagonist is sent a relatively short distance into the future (maybe a year? I've forgotten). When he arrives in this "future" he finds himself in a completely ...
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3answers
140 views

Which Sci-Fi work introduced the idea of “Resurrection of Dead by Time Travel”?

In Sci-Fi world, Time can re-written. Lots of Sci-Fi works exploit time travel to bring back the people once dead, either in the same timeline or in a different timeline. I asked a similar question: ...
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2answers
211 views

Which Sci-Fi work introduced the idea of “Protecting Child-self”?

The special case of Bootstrap Paradox in which a guy travels back in time to protect himself is common these days. I have encountered it countless times. The first example I encountered was in ...
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1answer
120 views

A book I read as a teen: maze that transports you to the past, girl chasing baby carriage

I read this book 21 years ago. The main points I remember from the book are a maze that transports you to the past: in the present the maze is chalk I think, and in the past it's a full hedge maze. ...
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2answers
195 views

What kind of paradox is this? [duplicate]

I was wondering something regarding the Back To The Future movie: Marty McFly is on stage and he's playing Johnny B. Goode. Marvin Berry phones his cousin Chuck Berry (the person who wrote the song). ...
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145 views

Identify Short Story Time Slip/Bubble

The story begins with main character (unsure of their sex, but it's only one person) driving down a road, surrounded by farmland, maybe some trees and things. They go off track, not sure if its in ...
4
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1answer
115 views

Story where humans artificially accelerate the cultural/scientific status of various planets to create allies against an invasion

Can anyone identify this story for me? I read it in my youth and wish to have my son read it. Ahead of an impending invasion several men are sent to a distant planet in the invader's path, set to ...
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0answers
166 views

Looking for a time travel novel

I must have read it in the seventies or eighties, and I have no idea if it was a translation or not, and if so, what language it was in originally. A man dies during an accident (in a scientific ...
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2answers
247 views

Why did the Doc decide to use a train?

In Back to the Future III, Marty gets back to 1985 by putting the DeLorean in front of a train, then using special fuel to increase the speed of the train. If this failed, the DeLorean - with Marty ...
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1answer
362 views

Why didn't the two Biffs go into shock?

So, in Back to the Future II, we see that when 1985 Jennifer sees 2015 Jennifer, they go into shock as predicted by Doc Brown. Yet, when old Biff sees young Biff, they don't go into shock. Why this ...
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4answers
9k views

What happens if you exceed 88 miles per hour?

So, we all know that the special speed at which the DeLorean will travel through time is 88 miles per hour (if you didn't already, now you do). Yet, you will only travel through time if the time ...
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0answers
104 views

Why isn't Lucy always seen when time travelling?

Question about time travel in the movie Lucy. When she is travelling back in time she can be seen by the: Lucy ape the dinosaur is going after her the native Americans But people don't notice ...
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3answers
9k views

Where is Hill Valley?

Many BTTF fans know that Marty, Doc and Jennifer arrive in Hill Valley on October 21st 2015, and were eagerly awaiting that date. As outlined in this question, they arrive at 4:29PM. However, the ...
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Looking for a book about traveling back to time of dinosaurs [closed]

I don't remember a title or characters or author sorry I vaguely remember the plot line A group of people travelled back to time of dinosaurs the book was divided into a part 1 and 2 and at the ...
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1answer
68 views

Poem about a time traveller and an alien fighting as mercenaries with swords

Read this in the 80's in a compilation of military Science Fiction short stories. The author/speaker is a human time traveller who has gone back in time and become a mercenary at a time when swords ...
5
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1answer
202 views

In Predestination, what is the purpose of the 50 year rule?

I've been able to deconstruct and understand most of the logic within the world of Predestination. However, the one thing that didn't seem to really get explained was the rule that things get weird if ...
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0answers
144 views

Woman is sucked into a book with a medieval world at war

I started to read this book a while ago and did not finish it. I would like to read it again. A girl was walking down the stairs while reading a book when she fell and landed on top of the book and ...
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3answers
525 views

Why is getting back to the future always such a fuss?

While getting to the past obviously requires some effort or accident, why (in-universe) are the crews going to such lengths to recreate the time-travel circumstances instead of simply travelling ...