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I gave this a quick test on sandbox, and agreed with the comment that I should steer away from the physics part and focus on the geology, etc. Assuming Europa's ice crust is 10km thick as some spe...
Imagine someone from the modern day somehow gets transported back in time around the same time of WW2 without warning ahead of time. He has with him a laptop, graphing calculator (and a hand full ...
I've built a device, it's capable of turning matter to energy and energy to matter with perfect efficiency, I've got the resources to build a space station in secrecy, and I want to get off the pla...
A large solar flare event ignites the atmosphere of Earth, but luckily, humans have been preparing for an event like this for some time. We have a fairly large shelter around 2.2 kilometers undergr...
Okay, so now that we've established that the badger folk (or Melinae sapien, if you want to be politically correct) are trading their ore to the humans for cat food. Now we need to determine what ...
Lets say I have a space fleet flying to attack an installation. The enemy knows I'm coming but not my numbers or exact disposition. Since I'm moving much slower then C the light from my fleet wil...
Well, I ask the question because apparently I am going to aim for NaNoWriMo. I am calculating the density of a planet with 1.8 Earth masses and 0.9 Earth radii, but last I checked, the calculation...
In this question, it's pointed out that the L3 Lagrange point, where a "true" Counter-Earth would lie, is in fact unstable, and over time any object there would drift into a different orbit. Obvio...
Many fantasy stories involve large spiders like in Harry Potter. These creatures behave almost exactly like normal spiders despite their size. My question is: can large spiders still walk upside d...
Vertebrate tooth enamel is made from Hydroxylapatite, however this need not be the only material available that an alien species could use to make teeth or tooth-like structures. Given that an ide...
Note: I am aware of a previous question Physiological effects of living on a world close to a black hole As I understand it, that question refers specifically to a planet that is in a non-ideal ...
So this was done in Starship Troopers and I am curious if it is realistic for interplanetary warfare. The idea is that aliens launch meteors at major metropolitan areas...and it ends poorly for th...
Stars generate their energy by fusing lighter elements into heavier elements. The most common reaction in Sun-like stars is the conversion of hydrogen to helium via the proton-proton chain, but hea...
Based on this question and answer about a human sized creature that lives completely on textiles, how feasible is it for a creature to consume nylon and polyester to derive fats/lipids useful for b...
What's the easiest way for your stereotypical aliens to destroy civilization from orbit? I'm taking "destroy civilization" to mean the destruction of all large-scale forms of governance, but bonus ...
This question prompts me to evaluate the possibility that the romans or greeks could be blown in a storm to the Americas and survive if they had enough water provisions? Or maybe not provisions bu...
All the worlds I've seen built by me or others have surfaces that are mainly water. Is it possible for a habitable world to exist if the world is mainly land? I'm only talking about 55-65 percent l...
In the near future, drones replace military fighter jets that require human pilots. These drones will be travelling at many times the speed of sound. Highly sophisticated drones will be able to eva...
Based on this question about an impossible barbell planet, how hot would the bar be if it extended from halfway in the Earth's mantle to an altitude of 2r of Earth's radius? The diameter of the bar...
Once the geography of the world is designed, it needs a planetary system to inhabit. But how should that solar system look? The only constraint is that the system needs the new world to be placed i...
Okay, my first trial run, How would humans and society react to a superhero existing and saving the earth?, of social sciences with hard-science is looking some what sickly at the moment (maybe som...
This is going to be a test run of hard-science, social science edition. This is in accordance with http://meta.worldbuilding.stackexchange.com/q/2348/8914. Okay, so a meteor is about to hit the ea...
It's the future and oil resources have run out. A scientist has suggested using personal fart power to meet our individual power needs. World governments are seriously considering this. They have ...
This is the first question in a series on the physical limits of the human body. The intent of this series is to, illustrate the upper and lower limits of human biology for the purpose of buil...
In the world I'm building, the day lasts 9 of their years. This means that they are almost always on the move, living in blimp-like cities and houses. I've been designing these and I am having trou...
