Linked Questions

4
votes
2answers
1k views

Logically consistent FTL without time travel [duplicate]

If relativity holds, than faster-than-light travel would allow for time travel into the past. However, some claim that if all FTL travel used only one frame of reference, there could be no temporal ...
2
votes
2answers
548 views

I have an FTL missile and it is causing paradoxes I don't want in my universe, what do I do? [duplicate]

This is something I have had going in my head that actually hurts to a strong extent as I just can't figure out what would be so great about having a FTL missile over a laser and a paradox that is ...
1
vote
1answer
184 views

FTL and causality [duplicate]

Let's assume that a method for FTL has been found, and for whatever reason, it work. Given our current knowledge of physics, what would be the consequences? For example, under what circumstances ...
0
votes
0answers
89 views

A relatively relativity-safe FTL [duplicate]

Relativity is fun, but it does have some downsides. In practice, travelling near the speed of light makes you travel into the future, which is problematic. Relativity also doesn't seem to agree with ...
42
votes
19answers
9k views

Standardisation of Time in a FTL Universe

Here on Earth, time standardisation was enabled by the invention of accurate time pieces which allowed us to create a global constant (GMT/Zulu time) and regional offsets. If we travel outside our ...
31
votes
15answers
5k views

How to avoid FTL as a plot device?

Many SF stories feature faster-than-light travel as essentially a trope: Roddenberry has stated☡ that the Enterprise travels at the speed of plot. As an allegory of the south seas, or some throw-away ...
51
votes
10answers
4k views

Implications of Newtonian universe

I'd like to remove the speed of light limit from my world. However I don't want to just hand-wave the consequences. How should my universe look if: light travels at infinite speed, and so do gravity ...
33
votes
8answers
7k views

Does my Fast-as-Light travel method run afoul of causality or relativity?

I am writing a hard science fiction story and I want to avoid violating known physics, while still enabling some of the classic mainstays of science fiction under the auspice of sufficiently advanced ...
17
votes
17answers
5k views

How to Protect Against FTL Sneak Attacks

Background: Following the development of faster-than-light technology, humanity has spread across the stars and encountered many kinds of alien life. While the galaxy is mostly peaceful, occasional ...
17
votes
13answers
3k views

Science-based FTL drive

So I'm writing a story about a crew of scientists that explore the universe searching for a hidden knowledge in embed in the fabric of the space itself. More like to the Destiny's crew from Stargate ...
30
votes
9answers
4k views

Is there a scientifically plausible faster-than-light communication system?

In series such as the Hyperion Cantos and Ender's Game, there exist fictional faster-than-light communication systems allowing either instantaneous, or near-instantaneous transmission of information. ...
21
votes
7answers
7k views

How plausible is an Alcubierre drive, really?

Like on a scale of one to ten, how plausible are Alcubierre drives in terms of our current understanding of physics? Plausible enough to be considered "hard sci-fi", or are they just another form of ...
14
votes
7answers
3k views

How does a teleporter logically lead to time travel? [closed]

I've read a good number of FTL equals time travel questions and answers both here and on other sites, but for the life of me I just do not get the connection. Let's take a really simple case: say at ...
7
votes
10answers
569 views

Military Implications of Instantaneous FTL?

In an example future world, one can use some form of FTL to instantaneously transport any ship from one point to another point (within the same galaxy, to keep things simple). The device required to ...
7
votes
7answers
1k views

FTL in a relativistic universe: can my scheme be exploited to make a time-machine?

The introduction of FTL travel/communication in a relativistic universe may effectively be equal to having a time-machine with all the problems that may entail for causality. I would like to avoid ...

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