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

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Why did the Earth stay still in Star Trek: First Contact?

When the Borg Sphere left the Cube and flew towards Earth and entered the temporal vortex, why did the Earth stay still? It was my understanding that the planet/solar system/galaxy rotate around the ...
14
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1answer
146 views

Short story - A ring that lets you relive the last minute

I think I read this in a magazine back in the 1970s or perhaps 1980s. As I recall, the plot went like this: The protagonist is working in a morgue when a body is brought in. The dead man was a ...
5
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1answer
183 views

Airplane that can travel forwards in time but not backwards

I read a paperback book of short stories. One of the short stories was about time travel using an airplane, but the time travel was restricted to going forward in time. This resulted in a statue of ...
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0answers
34 views

How many dead Dougs are obscured in Deja Vu?

The plot of Deja Vu movie plays a lot with backward time travel theme. Backward time travel in science fiction can work in one of two ways: immutable timeline or mutable timeline. The first one ...
2
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1answer
118 views

Looking for an episode of a 90's show involving a man who can time travel after having a car accident

So, I remember those moments: A man had a car accident. After that he is able to travel through time. Every time he travels he sort of hallucinates and he is in some sort of a huge cave with a some ...
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Time travel book from the 50's

I'm looking for a time travel book that my parents and I have both read. My father thinks he got it in the 50's. Plot: A man is murdered while conducting an experiment and wakes up in a different ...
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122 views

SciFi book where scientists learn to peek through time (possibly controlled miniature wormhole?). Computer screens were carried like a handkerchief [duplicate]

Read it in the 90's. I remember one specific part where the inventor of the peeking mechanic has his Eureka moment, and has the presence of mind to give a thumbs-up/wave to the future, when they look ...
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1answer
109 views

Red Dwarf: time and space travel paradoxes in “Tikka to Ride”?

The Red Dwarf episode Tikka to Ride has confused me more than any previous episode: How was it possible for the crew to use the Time Drive to travel back to 1960's Earth, when in the previous ...
4
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96 views

Time traveling family visits end of the universe

Been trying to remember this one and haven't found it despite extensive googling. This was young-adult or magazine anthology fiction about a family that ends up time traveling, but can't get back to ...
6
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1answer
792 views

What SciFi series(?) of books features humans time traveling into prehistory where an alien race is already in residence? [duplicate]

There is no return for the humans. I seem to remember that the humans and aliens find a way to get on, or I could be wrong. A small house in the Camargue of France is the link between the present and ...
3
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1answer
97 views

Why did Kyle choose that time in Terminator Genisys

Kyle "convinces" Sarah to Why doesn't he instead I get that it sets up dramatic tension (countdowns!), but is there any coherent in-universe explanation for this?
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168 views

Sci Fi Short story about a prison with just one prisoner?

i read it in a paperback story collection that I purchased new around 2006 to 2008, possibly themed as time travel or alternate realities. For most of the story, we do not know who the prisoner is, ...
4
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1answer
176 views

Man goes back in time to observe WW2 and gets stranded in an alternate future

Anyone know the name of this science fiction short story. Man goes back in time to observe Second World War, falls in love, tries to return to future but ends up in a alternate future with no power ...
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1answer
80 views

Time travel and geographical location at re-entry [closed]

One point which annoys me in time travel stories, is that they all seem to dismiss an important aspect: geographical location at re-entry. Say you are able to create a machine that travels backward ...
4
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2answers
261 views

What is the point of sending anything back in time in the Terminator movies?

As explored in another SCF question, the only way to answer the bootstrap paradox is to say "every time someone is sent back in time, time branches into a separate line." But if that is the case, ...
6
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3answers
312 views

How is it possible that 7 of 9's 24th century ocular implant is better at detecting disruptions in space-time than a 29th century Federation timeship?

Star Trek Voyager "Relativity": BRAXTON: For some reason, I always think you'll remember. I'm Captain Braxton. This is Lieutenant Ducane. You're aboard the Federation Timeship Relativity. ...
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0answers
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How did Walter send back the Machine in the Amber Timeline?

One of the main plot points in Season 3 of Fringe was the Machine. In the Original Timeline, i.e. the timeline shown in the first three seasons of the show, in 2011 Peter uses the Machine to destroy ...
3
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5answers
237 views

Origin of black hole time-travel and alternate universe tropes in sci-fi?

As far as I know, the first person to suggest in the scientific literature the existence of what we would today call a black hole was John Michell in the Philosophical Transactions of the Royal ...
5
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1answer
264 views

Man travels back to before life developed on Earth and stomps on early plants

I read this story in about late 50s, possible in F&SF magazine. A man travels back in time to before life came on land. He likes it there because it is so peaceful. Then he sees the first ...
3
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1answer
243 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
103 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
103 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
64 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
104 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 ...
7
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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 ...
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6answers
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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
107 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
130 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
116 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
225 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
70 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 ...
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4answers
506 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 ...
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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?
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2answers
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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
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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
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1answer
72 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 ...
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1answer
77 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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2answers
119 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
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3answers
430 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 ...
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0answers
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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 ...
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1answer
212 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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1answer
161 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
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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 ...
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11answers
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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, ...
6
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1answer
92 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 ...
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1answer
106 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
157 views

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

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
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1answer
278 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
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1answer
161 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 ...