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I'm trying to build a story around a supermassive black hole, which is ejected from a merger of two galaxies, that is hurtling our own way. What is the smallest realistic distance at which the blac...
Many fantasy worlds use a "Medieval Stasis"trope. What resources could we expect to become depleted during a stasis? Surely, since technology is stagnant, the people would mine all the materials th...
Assuming the atmosphere on a Niven ringworld is retained by gravity, what shape would it be? Full details of Ringworld http://larryniven.wikia.com/wiki/Ringworld As I understand it, Niven pro...
Hopefully this isn't a duplicate; I wasn't able to find another question which addressed this, at any rate. Let's say I have a generational spaceship going off to another solar system to establish...
I have two magical stones. The first one"”let's call it fire stone"”is a stone that able to increase its temperature equal to that of a normal fire. The second one"”as you might already guess, is ...
There are many tiny humanoids in fiction, the Arquilians of Men in Black, the Gargantians of Buzz Lightyear Star Command and a few others. This raises the question, is it possible for a humanoid sp...
Would a rocket or Bussard ramjet powered by monopole induced proton decay (Callan-Rubakov mechanism) be a feasible method for near-light interstellar flight? There are such drives in the Orion's Ar...
Scientists recently discovered a propellantless drive capable of completely negating gravity with low energy inputs! Huzzah! Sadly the Earth is going to be destroyed soon by a rogue handwave. Looki...
Suppose a team of astronauts have travelled to another solar system, and are currently living in a craft which is in Medium Earth Orbit of a planet which has oceans, continents, and complex life. A...
I've looked for an answer for this, but the only information I could find dealt with the ring itself. All I want to know is what would change on the Earth if all problems were solved and the ring w...
So I've always assumed Mars never had enough available CO2 on-site for terraforming, something that new research seems to have confirmed. But my ideas have always relied on getting CO2 from altern...
Humanity, with modern science, has established that the Big Bang happened 13.8 billion years ago. The universe appeared in a low-entropy state, and for billions of years has been expanding and movi...
I am currently designing a highly intelligent species for a sci-fi project I am working on. They are quite similar physically to prehistoric salamanders or similar amphibians, but I am having troub...
In my story, humans have colonized both a high-G and a low-G world in the same star system. How would surface vehicles have to be designed differently for practicality and economy on each of those...
Extremely advanced civilization on a computerized space station orbiting a desolate uninhabited planet. There are no other known civilizations within this station's sphere of observation. Not many ...
An IPCC report of Oct 8, 2018 indicates - to keep the world temperature rise at or below 1.5 C, we need to reduce our CO2 emissions globally from the 2010 level by 45% by 2030, and a further 55% r...
A scenario in the far future -- The moon has been successfully terraformed. All problems have been worked-out, from flinging volatiles into collision course with the moon, up to creating and retain...
In this scenario we have a brown dwarf with a powerful magnetic dynamo from metallic hydrogen. The magnetic field is modeled after Jupiter's but just three orders of magnitude more powerful. Orbi...
This is an idea for a space station on the surface of Eris (but could work on other celestial bodies), using rotating rings to simulate gravity. The idea is that these rings would sit horizontally ...
(Beforehand I'll excuse myself for my english. If you didn't need to know that you can just ignore it) There's a network of root-like life forms in the top layers of my planet. They use some kind ...
I'm fairly new to the idea of writing.... anything, and I was asked to make a character to insert in a friend's world. I am trying to create a fictional character that has the power of manipulati...
Inspired by this question: Consider a trinary star system, in which the three stars are arranged in an xy plane and all revolving the same direction, equidistant from each other. The inward pull...
This is the first question about colonizing an alien world; the second question on agriculture on this planet is here. So here's the idea: human beings travel to and land on an Earth-like world wi...
[EDIT: this question is about life on Earth surviving, not the physical destruction of the planet] Could the Earth survive a gamma ray burst if that burst occurred in our galaxy and the Earth is ...
Disregarding how battleships are really big targets and not really viable in the modern era anymore, I would like to ask how big a battleship can be built before it starts being so large it sinks. ...
