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Premise Suppose an earth-like world in the near-future. Then aliens come and decide to play a mischievous trick on this world on an epic scale. The goal is to disrupt Earth's time by 18 minutes. S...
In my book series (link here), there is a blob creature (lime-green in color, has a radioactive glow, is sentient, has a bizarre and uncanny intelligence level (has the emotional intelligence and "...
Humans are savage creatures. This is indicative in the way they get rid of bodily waste. Squatting over a glorified hole in the ground or aiming their spear tip toward same hole and hoping for succ...
I'm looking for ideas for a highly contagious airborne biological weapon (virus, bacteria, other) that would kill its host in a matter of days to a week or so, but that, once all infected hosts are...
Would heavier clothing solve the problem of bone and muscle loss in Martian gravity? It doesn't have to be a perfect solution, I just don't want my Martian colonists to be total wimps compared to E...
A small minority (on the order of one in one million to one in ten million or so) of men and women in this world tend to suddenly manifest their supernatural heritage/psychic abilities/superpowers ...
The orbit of mercury is different than rest of the planets. The reason for this seemed unaccounted for in Newtonian physics, and was later explained by Einstein's theory of relativity. Here is a ...
Background It is the near future. After a major world war and limited nuclear exchange, the nations of Earth have consolidated into a few blocs. The threat of further war and the cumulative damage...
So I'm making this game where the player has to launch probes into interstellar space within a 100 * 100 light years map to detect threats that could wipe out humanity in a few decades. Everything ...
What is the most powerful magnetic field that could be generated by a planetary object? The measurement of 'powerful' will be field strength ($\mathbf{B}$-field) at the planet's surface, in teslas....
Having looked at some of the questions regarding creatures with more than four limbs, I've found some useful info, like the idea that additional limbs increase stability while requiring more brain ...
I use the koppen-geiger climate maps a lot but I haven't found any for Pangaea. Would the climate zones be the same if the continents were in the Pangaea shape or is it something different? It woul...
This is the first of possibly several posts about the following scenario, in which Earth's sea-level rises 2 km overnight, generating a world map looking like this: Question: What would be the c...
Science-based answers, please. Key points: the main concern is radiation protection for sustainability of human life (and accompanying plant and animal life ecosystems, whether earth-like or n...
I'm currently designing an advanced alien race that has found a way to prevent its host star from dying. But I'm not sure how exactly would that happen. So my question is, "How could you prevent ...
This is a world building question in a preventative context because those people or countries would be left fully functional while others gone and the safe areas is where the world building would b...
I've asked a whole array of questions, so far, centered around an ongoing project of mine that features a world, in an alternate evolutionary timeline, where a variety of well-known mythological cr...
I would like my human colonists to settle on the high plateaus (2500-3000m above sea level) of my planet thus never meeting the civilization living in the lowlands (in a huge forest so they aren't ...
Context This creature right here is one of the decedents of placoderms that that transitioned from rivers to land. The got onto land during the Middle Devonian and remained isolated from all oth...
After getting help from the members of this site with Worldbuilding an Earth-like world around an F-Type Star, I have another question. The Planet's radius is 90% of Earth's. The Planet's rotation ...
At the end of Book 6 of my book series, a magic ritual has caused a large meteorite (around 1/4 the size of the one that caused the chicxulub crater) to ram into the small planet (around the size o...
Before picking specs, I need to ensure feasibility. Only one of the planets need be Earth-like; in fact, I would prefer if the other planet were rather small and dead, like a moon. The orbits will ...
I have the radius, volume, mass and density figured out. It does not have a moon. I do wonder how that will affect the rotation. The Earth's rotation was considerably faster before the creation of ...
In my book series (link here), Aurea (a planet based on Byzantine Anatolia) is conquered by a group called the Tatians, who have access to technology that would not be out of place in Star Wars (fa...
Say that you have a medium-sized, bipedal, vertebrate-like creature. It no longer has the need to have arms, so they atrophied until they disappeared entirely. Now imagine an animal that shares s...
