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Initial situation: I have cold planet with an average temperature below the freezing point. There is a magnetic field. The planet is almost as big as Earth and can have an atmosphere. The planet...
Suppose a world suddenly is being attacked by frequent tidal waves caused by some event in space. What type of event could have caused this? Any side effects caused by the event, such as the relea...
I am referring to the situation described at the start of the movie 28 Weeks Later, where Britain had been wiped out by a zombie virus, but the rest of the world was (seemingly) fine. What would b...
Setting: Earth, in the future, near 2060 or 2100 Technology: a bit more advanced than ours Armies and police forces are already using systems for crowd control. Some devices can generate disco...
I found an interesting Wikipedia article, quoted in an answer here. I'm looking into writing a story where someone has built a Death Star. The purpose of this craft is important to the story (and ...
Summary: I am looking for a portal transportation mechanism that is consistent with the laws of thermodynamics. Portals (or wormholes or gateways, something that connects two different locatio...
This is somewhat of a follow-up question to my ammonia-based world question. I've found out that the melting point of ammonia is at 25°C at a pressure of about 1 MPa (about 10 times the atmospheri...
Assuming interstellar travel, and self-sufficient colonies in other star systems, what are some methods of destroying the Earth while leaving minimal impact on the colonies? Context I would like ...
Mars' gravity is 38% of that of Earth's. Supposing a human born and raised on a Mars colony traveled to earth later in their life, would they be able to survive the increased gravity? For example...
I am working on constructing a world which is basically (from the northern pole to the southern pole): smallish frozen over ocean huge land mass encompassing the northern hemisphere tremendous oc...
I did a little looking and it appears stars outside of 10 parsec/33 ly will have very little effect on the Earth. What it did say was that inside that range the gamma rays would affect our ozone l...
My question is mainly related to the impact on food production if the climate changes made agriculture more difficult in the state of California but also in the other American and Mexican states fr...
The situation I'm considering is as follows: A space ship (a transport ship operated by two people) crashes onto a planet on which a swing-by was planned. The crew could escape using an escape cap...
I had this idea the other day just for the heck of debating about if it would be feasible to build a bridge that crosses North Atlantic Ocean from Canada to Spain. I mean from St-John's (Newfoundl...
It seems like nothing can move faster than light and this is quite bothersome for interstellar travel. It takes decades in the best case to get anywhere interesting in our little Milkyway (Many tho...
Suppose that a planet whose size was somewhere between the sizes of Mercury and Jupiter impacted the Sun. Would such an event change local stellar activity sufficiently enough and for long enough ...
Are there realistic circumstances that a planet would be accelerated (either artificially or naturally) to the speed at which relic radiation becomes so blue-shifted that the planet is illuminated ...
My premise involves a habitable planet with a dual core: it has two masses similar in composition to Earth's core, which revolve around each other over the course of hundreds of thousands of years...
What sort of xenobiochemistry would support information-carrying macromolecules like DNA if only trace amounts of phosphorus were present on an alien planet? Since the phosphoribosyl backbone of DN...
One of the first steps in technological is the ability of a civilisation to forge tools* humans achieved this by using fire and creating forges. There are obviously underwater heat sources but I d...
It seems that people who live at very high altitudes have demonstrably "thicker" blood, highly concentrated with red blood cells to overcome the low concentration of oxygen in the air. Moving betwe...
Following on from this question and assuming the race in question had developed the ability to create tools how would they approach the need for mass calculation. Our early computers were used to ...
If a spacecraft is in low earth orbit ~400 Kilometres above earth. How big does it need to be visible from earth with the human eye without telescopes, with enough of its details to clearly distin...
What would be the effects of high or low gravity on human body development? How would the human body develop under a different gravity? Many science fiction stories explore the idea that people fro...
Building from this and this, given an aquatic civilization somehow manages to forge tools and build computers, could it build space-faring devices? Also another development that would come earlier...
