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Lets assume a city exists underground, either in natural caves or synthetic tunnels. Are there any food sources underground, and what kind of population can they support?
As fas as I know, there isn't a single plant on Earth that (naturally) produces any sort of luminescence. But it is seen in science-fiction worlds, especially Avatar. From an evolutionary point of...
In almost all science-fiction stories that include alien races, said aliens are similar to humans in many ways: bipedal (and often humanoid), communicate with sounds coming out of a mouth, orient i...
The length of a day on different planets in the solar system varies a lot. For instance, Mars' day is about the same length as Earth, while a day on Venus is equivalent to 243 Earth days (source). ...
On Earth humanity has taken the dominant role (excluding dolphins and mice of course). We know of conflicts in pre-history where our ancestors have overtaken other species and slowly wiped them out...
Every species I'm aware of on earth has two sexes (with the possible exception of species which change their sexes to allow self fertilization). Is it possible for a species to evolve which could ...
This question focuses on the initial creation of landmasses. What are the processes that causes land-masses to form, and continents and islands to rise up from the sea and sink back into it? How...
Now, taking out the cost to produce/collect it, assume somehow we perfected a formula or find a natural source (because that is currently very prohibitive), how feasible would be to use antimatter ...
I have a colony of humans living underground in man-made catacombs on another planet. They are, essentially, digging/blasting as they go; they did not create a complete underground city first and ...
Airships are a hallmark of countless steampunk and dieselpunk constructed universes. Of course, in our world, they were around for a short while. I want to know what effects geographical circumstan...
I am looking to have a Tunnel drilled through a world and deal with the physics of What happens in the centre of a planet, what happens with the heat at the core and whether it is faster to travel ...
How big a difference does the Earth's liquid outer core and mantle make for the evolution of complex life? If all of Earth's parameters would be the same, but it had a solid interior just like Ma...
If two (or more) planets are within travel distance from each other and they often trade with each other, how likely is it that these planets cultures influence(d) each other? For example: On plan...
The inspiration for my question comes from The Great C by Philip K Dick. To summarize, the Great C is a computer that has taken over a large portion of the planet. It uses proxy agents to keep co...
Conquest and discovery has been an important part of developing the global political structure of today's Earth. After we expand and settle other planets, whether within the same solar system or n...
Space is two things: empty and (mostly) dark. This makes it really, really hard to hide in it, because to do anything in it, chances are, you'll be shining a big bright light through it. Even if ...
I'm working on the timeline for my world, but I keep getting stuck at the origins. I want to have had an advanced civilization (modern levels, maybe a bit beyond) that was destroyed in a vaguely de...
The Question of the Tunnel through a Planet grinds my mind. How could you dig a Hole through the fluid mantle of a planet? Would your walls not constantly break and collapse on you after the 15-...
What environmental effects (if any) would ever cause blue to be a colour that a plant would choose as an evolutionary advantage? Bonus: I'm looking for light blue plants as a preference. EDIT: T...
I'm interested in writing a story about inhabitants of a permanent base on Mars, a few decades after all life on earth has (presumably) been wiped out. Preferably, I'd like them to still be there, ...
As the title suggests, what happens to a planet geologically and geographically over time? This question came to mind from the many sessions of Civilization I have played where when you set up a c...
Related: How would a completely urbanized city-planet be maintained? How would the global environment of a completely urbanized city-planet be affected? Why would a completely urbanized city-plan...
Related: How would a completely urbanized city-planet support its population? How a completely urbanized city-planet be maintained? Why would a completely urbanized city-planet exist? The prope...
Related: How would a completely urbanized city-planet support its population? How a completely urbanized city-planet be maintained? How would the global environment of a completely urbanized city...
Giant winged beasts such as the Roc and the western dragon feature strongly in mythology. Is there a maximum size on a biological winged flying creature? How would an atmosphere different from Ea...
