Linked Questions

39
votes
25answers
9k views

Why would a civilisation choose to inhabit a single enormous vessel instead of maintaining interstellar colonies?

The setting: Very distant future, Earth is long gone/forgotten/just not around anymore. Humanity, whatever it may consist of (people, AI, something in-between) inhabits a single vast generation ship ...
70
votes
17answers
18k views

How can I move a planet?

There are a lot of answers on Worldbuilding about how to destroy planets - just as an example - and they seem to be the method of choice for many people intent on destroying the world. My objection to ...
25
votes
14answers
8k views

How do you non-catastrophically reduce the mass of the Sun by half?

In my previous question, I asked how much mass the Sun would have to lose in order for Saturn's orbital velocity to be its escape velocity. The answer proved to be somewhat unexpected - when the Sun ...
19
votes
13answers
5k views

Would biological brain in a box considerably increase life expectancy?

By "biological brain in a box" AKA Brain in a vat I mean a robot which holds a physiologically normal human brain, and produces identical input / output as would be produced by a healthy human body (...
30
votes
12answers
4k views

How would you avoid making the ability to join a hive-mind very overpowered?

In a sci-fi setting, suppose there is a species that has a very strong cybernetic enhancement, to the point where they can actually form a kind of pseudo-hive-mind, while still retaining their ...
13
votes
11answers
2k views

What form of currency to do transactions between us and droids?

Very soon I suspect we will see the rise of machine in the next couple of decades if people continue abusing Moore laws, suppose robot laws are hardwired into their core how can we make them believe ...
5
votes
10answers
485 views

What can be a good strategic point in outer space

On earth where we puny humans fight each other on land air and sea we have of a concept of strategic points which are oil fields trade choke points islands in the sea mountains on land places where ...
15
votes
7answers
5k views

How can we extinguish a supernova?

Assuming in a galaxy far far away there is a Type 2 civilization (currently on the verge of making the transition to Type 3). Their scientists predicted that the star (red giant) they are orbiting is ...
4
votes
6answers
338 views

Gravitational Implications of a “Light Year City”

The "Light-Year City" Questions — What would be the gravitational implications of a city in the far, far distant future, with an area spanning one square light year (3.456 × 10^25 mi² area)? This ...
37
votes
5answers
8k views

Can a planet survive a supernova?

The Sun has nowhere near enough mass to enter the branch of stellar evolution that would lead to a supernova, fortunately for us. However, there are planets that orbit stars that are destined to go ...
9
votes
4answers
493 views

Can I trigger supernova artificially?

As far as I know stars are going supernova as a natural process. Can aliens trigger it artificially? If this is possible then: How can I do this (what minimum technology and civilization development ...
7
votes
2answers
5k views

If the sun were to go supernova, how long would Earth have before it was consumed? [closed]

Assuming some magic handwavium caused the sun to go supernova, how long would it take to reach Earth and wipe out the planet? I know it would be eight minutes until the light reached us, but how fast ...
3
votes
2answers
239 views

How can Nebulae be harvested?

My question is about a far off and seclusive colony in the reaches of the Orion nebula. As they are relatively isolated they have resorted to harvesting the nebula itself for resources. What I want ...
2
votes
1answer
205 views

What are the occupational hazards for mining the nebulae?

As a high mass star which have already burnt through all of the lighter elements and is now building up iron, the fusion reaction will no longer produce sufficient energy to counter its own weight. In ...