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

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1answer
113 views

Time traveller destroys the universe by going fifteen minutes back

Very short story from the 60s about a time traveller who travels back in time fifteen minutes only to tell the person he meets that the amount of energy it took to propel him back in time destroys the ...
3
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1answer
74 views

ID Story where a medical doctor is sent back in time to improve health

I recall reading a short story where a doctor (not the doctor) time travels and brings modern medicine to ancient rome (I think). The improved health leads to massive overpopulation in the present, ...
2
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1answer
63 views

Boy travels through time using a calculator

I read a book from the late 80's when I was 13 or 14 about a boy who travels through time using a calculator. I don't remember too much detail...but I do know that he was on the run from a bad guy who ...
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1answer
34 views

A question about the Project Almanac and the cameras used by the characters in the film

Just watched Project Almanac and my question is similar to another I read on here. I understand why there are two old camcorders at the end—the one David’s Dad used to film his birthday party and one ...
4
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0answers
103 views

Did Hermione shorten her life expectancy using the time turner? [duplicate]

When Hermione uses the Time-Turner she is making her 24 hour day even longer by going back into the past a few hours. Let's say her time spent in the past has added up to one year (I know it couldn't ...
6
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2answers
1k views

Why does The Doctor use Earth time?

Throughout the Doctor Who verse, one thing I have noticed is The Doctor using "Earth Time". When going through time, he will often say the year that the Earth is at, rather some sort of "Central ...
26
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6answers
5k views

How did the rest of the world experience Groundhog Day?

We know that Phil was stuck in Groundhog Day for many, many years, by his own reckoning, and that he was fully aware of it throughout his ordeal. But it seems that everyone else was blissfully ...
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0answers
91 views

One member of a group of time travellers is stranded in the future

I need help trying to find an old movie about a group of young time-travellers. The movie is probably from the 70s. Google has not turned anything up. I don't remember much about the movie except ...
7
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1answer
116 views

Time travel story with “push-pull” time lines

Another time travel short story, also from (probably) the 50s. This one is specifically not "Brooklyn Project". That involved multiple, independent changes of history. This one uses two alternating ...
7
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1answer
102 views

Short story ID: Bouncing-Ball Time Travel

A little help please. The story I'm looking for is probably late-50's to mid-60's, and may well have occurred in an SF magazine. A professor is demonstrating his new time machine to a scientific ...
3
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3answers
215 views

Does Starfleet know their kind of time-travel?

Time Travel in Science Fiction has multiple variants to cope with its paradoxes such as the Grandfather Paradox, the most famous of them being the closed time loop, where anything that seems to ...
4
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0answers
58 views

Short Story Boy Looks Through Telescope, Sees Future Self

A boy was in his bedroom and looked out through his telescope. He sees some kind of weird cloaked figure in the bell tower of a church and it freaks him out. The story goes on to follow the boy's life ...
2
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4answers
338 views

Do the time travel mechanics in Terminator Genisys make sense?

As far as I am aware, the Terminator franchise operates on the idea that time travel works by creating alternate timelines when something is sent back in time, allowing the future of the new timeline ...
2
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0answers
47 views

How was the messaging system in The Arrows of Time (Orthogonal #3, by Greg Egan) supposed to work?

In particular, why didn't messages being relayed from the future use up bandwidth and prevent new messages from being sent back?
21
votes
2answers
2k views

How much time passed between The Lion, the Witch, and the Wardrobe and Prince Caspian?

The book series will nonchalantly say "hundreds" or "a thousand" or "thousands" of years in different places throughout, but is it ever stated exactly how much time passed between Peter, Susan, ...
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2answers
110 views

Did the USS Olympia go forward in time?

DS9 "The Sound of her Voice": LISA [OC]: My name's Lisa Cusak. Until a couple of days ago, I was the commanding officer of the Olympia. SISKO: The Olympia. LISA [OC]: We left the ...
2
votes
1answer
67 views

What happened to the time portal in DS9 “Time's Orphan”?

DS9 "Time's Orphan": DAX: It's some sort of time portal. From the chroniton signature, we think it sent Molly about three hundred years into the past. So the Federation now has it's hands on a ...
-1
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1answer
67 views

Why did they use a transporter instead of somebody simply walking through the field grabbing Molly and walking back to the current time?

DS9 "Time's Orphan": DAX: It's some sort of time portal. From the chroniton signature, we think it sent Molly about three hundred years into the past. KIRA: I wonder what this place was ...
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0answers
28 views

Why do the O'Briens or anybody else remember the events that occured once Molly is returned to the original timeline?

DS9 "Time's Orphan": [Portal chamber] (All the tech stuff is gone except for lights.) O'BRIEN: Everything's ready to go. I've recalibrated the temporal field generator. We should be ...
8
votes
2answers
116 views

Identification: Looking for author/ title of time travel books

Looking for author/ title of time travel books (trilogy?). It is a dying planet story, and time travel is regulated/ policed (under government control). Books and historical records are kept off ...
7
votes
3answers
390 views

Time Turner Problem - See Yourself

There is a question I wanted to ask some Time ago and I'm not quite sure it hasn't been answered already. In fact if so, i did not find something. At the moment I do not have the books with me, but I ...
0
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0answers
65 views

In Repeaters why did nobody notice (spoiler)?

In the Movie Repeaters (2010) why does nobody notice I don't believe Michael returns after a day of killing and raping to the rehab to his room, lays down in his bed and sleeps there. I either ...
1
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1answer
186 views

Why did the timeline revert back to its original state after Janeway destroyed the temporal core in the episode “Year of hell”?

Voyager "Year of Hell part 2": TUVOK [OC]: Captain, we won't be protected. JANEWAY: Exactly. If that ship is destroyed all of history might be restored. And this is one year I'd like to ...
2
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0answers
123 views

Science fiction show that was shown in middle school in the 90's

I remember being in 6th grade in Home Economics (or something) and the teacher had us watching this science fiction show similar to Doctor Who where this team of people who where (orange?) jumpsuits ...
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2answers
210 views

Was Doc Brown about to break his own rules?

Richard's comment on this question made me realize that Doc Brown seems to be a bit hypocritical. Allow me to explain. The whole reason Marty ends up in 1955 (as opposed to any other point in ...
3
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11answers
6k views

Can somebody please explain the end of the movie “Project Almanac” to me?

I just watched the movie "Project Almanac." I kind of understood everything, I guess as much as a person can understand a time travel movie...until the end. David destroys the Circuit, clear box, or ...
6
votes
1answer
85 views

Need a book title: stars sent through black hole/wormhole

I remember reading a sci-fi book awhile back, probably early 2000's, but can't for the life of me find the book again or remember the title. Humans are already in space and they come upon a beacon of ...
1
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1answer
103 views

How did Miles O'Brien time travel?

In DS9 "Visionary" O'Brien time travels 5 hours into the future because of a quantum singularity in a cloaked Warbird orbiting DS9. I just watched the episode and am really confused. Here's the ...
8
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1answer
136 views

Can you identify this time-travel/alternate history novel?

I read this sometime in the 2000s, in another state, so I can't go back and check the shelves. A scientist discovers time-travel, or something like it -- it's a time-sea. Swimming in it causes ...
3
votes
1answer
254 views

What did Janeway do with the 29th century tricorder she took?

In the Star Trek Voyager episode: "Future's End": JANEWAY: Welcome to the twenty fourth century. I took the precaution of removing your tricorder. That's what it's called, by the way. ...
4
votes
1answer
155 views

Soldier teleports himself out of a tank using his mind; discovers he's from the future

I am looking for a book that I read many years ago as a teen. I think it was in the 1970's but the book could have been written earlier. It starts with a soldier in Korea in a tank that is hit by a ...
5
votes
1answer
825 views

Was Skynet limited in how far into the past it could send back Terminators?

I have always wondered why Skynet only sends back one Terminator at a time, and why it keeps trying to assassinate targets who know they are being targeted. After the first Terminator was sent to ...
12
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3answers
4k views

How did Picard actually cause the destruction of human kind?

Through the final episode of Star Trek: The Next Generation, we learn that This part is really unclear for me. How could the anomaly stop the combination of amino acids into the first proteins? Is ...
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1answer
182 views

Why did Picard describe the past as “the past” when he was actually there?

During final episode of Star Trek: The Next Generation Picard is moving back and forth in time and we can see three timelines: current, past and future. Two times during his "visit" to the past ...
2
votes
3answers
293 views

Which Time Travel theory does The Flash follow?

In the latest episode of The Flash However, this does raise the question: Which Time Travel theory applies in The Flash? ...would imply a single universe model, as changes in the past ...
5
votes
1answer
194 views

Short story where life is lived out of chronological order

I think I read this short story (within the past five years) which was a science fiction (possibly post-apocalyptic) short story anthology. There was some kind of event which caused the world to ...
5
votes
1answer
139 views

Man with saucer shaped machine that may or may not been a time travel machine

What is name of (TV?) Movie (possibly british) from between 1970-1980's involving a man with saucer shaped machine that may or may not been a time travel machine? I am trying to remember a film I saw ...
3
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0answers
76 views

Identify story about time-travelling assassin that can kill by touching people

Please help me identify a short story about a time-travelling assassin. His time machine is a car. He gets assignments over the car radio from "The Oracle." His 2 henchmen are named Chubb and ...
3
votes
1answer
148 views

Sci-fi movie where time-travelers(?) journey to ancient Rome/Greece(?)

I'm trying to remember a movie. The only thing I remember clearly is that there were modern explorers in a land or time that resembles ancient Rome or Greece. At the end of the movie during a ...
2
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0answers
82 views

Book about time travellers finding world with robot vs human gladiators and 100 ft jesus robot

Searching for SF book read in youth (80s) Time travellers go to cryo-sleep in mountain crypt, perhaps to avoid fallout from nuclear war? Wake up to find Earth much changed. Ruled by theocracies? ...
4
votes
1answer
179 views

Two spacecraft pilots travel at light speed, meet back on Earth in different era due to time dilation

I've been looking for the name of a sci-fi romance book about space travel but haven't been successful so far. I came across it a few years ago, read the plot on its back cover but didn't read the ...
3
votes
1answer
123 views

Scifi book with FTL travel that caused the ship to split into multiple copies

I'm trying to remember the name/series of this book that I read (at least) a few years ago. It had a sci-fi space travel theme, but was mostly set on this planet that had "zones" that kept people ...
3
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0answers
166 views

Time Machine Short Story in Letter/Essay format

I'm trying to remember the name of a short story that's written in the form of a letter to a doctor/professor (I think). The writer of the letter/essay, who is a scientist, describes an experience ...
2
votes
1answer
199 views

Is there any consistency regarding time travel in Star Trek?

Every so often, there's an episode of Star Trek involving time travel, and more often than not, the "rules" seem to change from episode to episode. For example, Future's End, Braxton explains that ...
3
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0answers
77 views

Looking for a children's book about a video game that allowed time travel back to the time of the dinosaurs

I'm hoping someone could help me find a book from my childhood. The protagonist is a young boy who gets given a video game that accidentally allows him to travel back to a time when dinosaurs are ...
10
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1answer
202 views

Pre-Historic Time Travel Short Story

I read a short story around 1989 in which a man somewhere in Europe (London/Paris maybe) sent a pocket watch somewhere (in time) and it came back a few minutes later rusted. The man decided to send ...
5
votes
1answer
131 views

Late 70's TV movie - woman sacrifices herself for child (neanderthal?) with blanket

I'm looking for the name of a late 70's/early 80's SFF tv movie or episode where a woman scientist sacrifices herself for a child (who may be neanderthal?) and they travel back in time or get beamed ...
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0answers
102 views

What happened to Thumper in The Butterfly Effect?

In the movie The Butterfly Effect, what happened to Thumper? Did he change or disappear? Or did it form a different timeline which caused him to change into something else ?
5
votes
1answer
160 views

SciFi / fantasy book from 80s about Jesus, present-day New York, time travel and the Dead Sea scrolls

I read this book back in the late 80s/ early 90s. I remember the title of the book as Mission. It started with a man being admitted to a hospital in present-day NY at Easter, with all of the wounds ...
5
votes
2answers
123 views

Young adult novel involving time travel, Asian military base

I'm looking for a child / YA book that featured time travel. It would have been published around or before 1975. I remember that it had some minor travel to the past, then travel to the future, to a ...