Questions tagged [interstellar]

Used for questions asking about interstellar (non-nebula) issues other than planets and travel. This would include interstellar (or multi-stellar) civilization, communication, combat, and the contents of space between solar systems NOT relating to potentially habitable planets. For planets in the interstellar medium, use the interstellar-planets tag. For travel, use the interstellar-travel tag. Questions that involve nebula should use the nebula tag.

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7
votes
2answers
196 views

Aliens pressure cook the Solar System, do we notice?

550 million years ago, aliens erected a spherical barrier 1/6th of a light-year (~10,000 AU) in radius around the solar system, centered on the solar barycenter. Things outside the barrier can enter, ...
27
votes
12answers
3k views

Deflecting an incoming star, railgun style

A friend of mine, ɹɐqooɟ, lives in a large globular cluster where stellar encounters and collisions are very common. His civilization is a Type 1.8 civilization, having built half of a Dyson Sphere ...
0
votes
11answers
3k views

Despite proliferation of graphene, why is gold still so expensive in the future?

Right now I can think of 3 important factors determining the trading value of gold and why is it so expensive: Factor 1 is longevity; this element rarely if ever reacts with anything, particularly ...
8
votes
2answers
236 views

How to Build a "Believable" Fall of Civilization? [closed]

Nice to meet you all. Inspired by Star Trek: Discovery's Season 3 and "The Burn", I've been re-reading materials where there has been a "Fall of Civilization" scenario and it seems ...
6
votes
1answer
179 views

Surveying the Barrier

This question is linked to a couple other SE:WB questions of mine, which focus on my current worldbuilding project. The setting is essentially this: aliens encased the Solar System in the very distant ...
7
votes
2answers
407 views

Could habitable planets form in an ultracompact galaxy?

I am wondering if habitable planets could form around stars in super dense dwarf galaxies. There are some super dense galaxies such as M60-UCD1 and M85-HCC1 which can have a typical distance between ...
6
votes
7answers
907 views

An effective way for interstellar communication?

Radio waves travel at the speed of light. Communication across vast interstellar distances is difficult due to weak signals and slow multi-year duration. I honestly imagine it to be like old times ...
3
votes
4answers
183 views

Feasibility of a black-and-white FTL drive?

I have an idea for a faster-than-light spacecraft that I would like to run by the expert minds in this community for a plausibility check. Basically the interstellar ship itself is of unspecified ...
2
votes
5answers
921 views

Interstellar war tactics with no FTL capabilities?

I have tried to conceive the most realistic hard sci-fi human/alien conflict scenario without invoking FTL magic. By realistic, I mean “War is the wrong answer but we do it anyway”. Im not trying to ...
2
votes
2answers
199 views

Would there be artificial gravity on a spaceship that undergoes constant acceleration?

One way of creating artificial gravity is acceleration- gravity by inertial mass. So in theory, if we would find a way to travel interstellar space by accelerating, reaching near light speed, would ...
3
votes
2answers
167 views

Humans meet a distant alien species. How do they coordinate? - Computers [closed]

Part of a series addressing the challenges of a mutual first contact. Previous question here Humans meet some distant alien species. They are mutual first contacts. After learning the languages of ...
25
votes
12answers
8k views

Humans meet a distant alien species. How do they standardize? - Units of Measure

Humans meet some distant alien species. They are mutual first contacts. After learning the languages of each other, they begin to share scientific and engineering knowledge with one another, but here'...
28
votes
17answers
6k views

Justification of physical currency in an interstellar civilization?

I have seen a similar-ish question on here, but it doesn't quite match my inquiry. Suppose you have an interstellar civilization (the means of travel between stars being stable two-way wormholes on ...