Questions tagged [faster-than-light]

For questions about settings in which superluminal travel and/or communication is a possibility.

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8answers
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How could an multi-world economy exist if FTL communication, but not travel, existed?

Imagine that we one day invent an ansible, capable of near-instantaneous FTL communication, but we can not transport physical matter any faster than light. Imagine also that we have gotten to the ...
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10answers
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Interstellar communcation with FTL

I am designing a world where humans have achieved FTL by means of the Alcubierre warp drive and are colonizing the stars. Originally I had communication pegged as being done with quantum entanglement ...
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1answer
710 views

Life at faster than light

Tachyons are a hypothetical particle that constantly move at speeds in excess of the speed of light. We haven't yet proven their existence, but neither have we disproved their existence (which is, as ...
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14answers
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Ridiculously Fast Supercomputer

Let's say that somehow, Earth suddenly acquired a computer with ridiculous speed. This computer can run a program described in a language of your choice, which can be described by a readme file that ...
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26answers
10k views

FTL travel is impossible. How is interstellar trade possible?

Assume a universe depressingly like ours, in which special relativity holds. No hyperspace, no warp drive, no wormholes, and even the limited get-out clauses offered by real world physics either don't ...
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5answers
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How would advanced aliens protect themselves from idiots with FTL?

Faster than light travel is Dangerous with a capital D. The main reason for this is because by the time you see something, you've already smashed into it and vaporised yourself, the target and any ...
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13answers
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Space Mechs or Tanks or Planes or Marines - Fighting in space without blowing up each other's starships

Suppose that there are 2 interstellar empires at war with one another, both armed with FTL drives which cannot be used within a certain radius of huge gravity fields, stars, gas giants, etc. Another ...
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5answers
167 views

Light-slowing Gas

Can we prepare a gas medium in which we can travel faster than light? This question struck me while reading a sci-fi where a scientist prepared such a gas medium. He sat in a chamber filled with that ...
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4answers
391 views

How would access to teleportation affect politics? [closed]

Imagine a society where the elite could travel via expensive, but commonly available portals. Transportation is now instant for those with money. How would this affect politics?
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6answers
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hypothetical criteria for non-paradox FTL

Many sci-fi questions here are derailed by complaints that the proposed version of FTL breaks causality. However, relativity-safe FTL concepts do exist. What range of conditions allow FTL (movement, ...
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7answers
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Can this version of the Alderson Drive be used to violate causality?

I'm working on a simulator-type game which I want to be at least internally consistent, and which I'd like to work as close to reality as possible. That being said, it's set in space, which means to ...
37
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11answers
12k views

How would two ships travelling at light speed communicate with one another?

Supposed we have a ship travelling at the speed of light, or very close to it, or over. A second ship is travelling behind it at the same speed. The second ship wishes to communicate something to ...
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1answer
956 views

How to Demonstrate that FTL Travel Violates Causality? [closed]

I'm trying to develop a story where a vast and sinister Alien Intelligence is bent on testing humanity's primitive knowledge of physics via the Q & A answer sites on their world wide communication ...
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3answers
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What if time travel had to take into account spatial distance?

In this setting, humanity has advanced to the technological capability of extra stellar travel via faster-than-light drives. However, due to distances between inhabited areas being extremely large, ...
14
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1answer
2k views

What would be the effects of traveling faster than light on a worldship?

Assuming a civilization has the technology and capability to build a worldship, a planet that doubles as a spacecraft, installs an FTL drive on it and has the energy to power it, what would the ...
21
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4answers
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How could combat involving Alcubierre-drive starships occur?

In a setting with Alcubierre-drive starships (as per my answer here), it is inevitable that once the technology becomes common enough and enough different polities and organizations have such ships, ...
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8answers
3k views

What would an external observer see when passed by an Alcubierre drive ship?

My answer to the question Is there a scientifically sound faster-than-light travel system for a spaceship? involved an Alcubierre-drive starship. However, that then got me thinking. What would an ...
31
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9answers
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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. ...
41
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4answers
4k views

Is there a scientifically sound faster-than-light travel system for a spaceship?

Recurringly in Sci-Fi spaceships manage to make it to lightspeed and above. Is there a scientifically plausible explanation of such capacity? How does it impact the spaceship's design and its ...

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