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I've seen a lot of questions on here about the possibility of more than two sexes but I've found nothing on the possibility of only a single sex. The closest thing I've found is isogamy, is there a...
I'm really in doubt if a fusion thruster could be used inside a planet (populated places). As i saw in the TV show "The Expanse", their fusion engines are really, really hot, hotter than the surfac...
If an FTL experiment created a black hole or keugleblitz within 100 au or less of our sun, what would it's post creation statistics have to be to consume the majority of our solar system within 10 ...
I want my world to contain a fruit that electrically shocks you to the point where it's painful, whenever you bite into it. Now, there are many organisms in nature that produce sensations similar t...
How do you check if a room behind a door aboard a spaceship has an atmosphere and pressure? This is so that you would not accidentally open a door to a room which is open to space. I imagine ther...
Imagine a tidally locked planet that revolves around the star at just the right distance that a habitable zone can be formed in between the scorching desert side of the planet and an icy desert sid...
There are thousands of species of spiders on Earth. Ditto insects. And, prehistorically, there have been times when there have been several, or even half a dozen species of hominins in existence on...
When I was in the process of designing a human with a head that has 8 times the amount of brain matter than a normal one. I came into a problem. What kind of neck muscles are capable of lifting a ...
There are a lot of acids in the world, many of them present in biological creatures. Humans, for instance, have hydrochloric acid in their stomachs. What I'm wondering here is just how nasty it cou...
Could humans sustain life after a k-t like extinction event? I know that a long lasting winter was a side effect then, but humans have technology to protect against cold. What other effects of an a...
In Stephen Baxter's science fiction Novel Ultima humans discover mysterious "kernels" which allow high speed space propulsion units to be built. The problem is that these kernels are only to be fo...
I'm working on a story that has several worlds but I focus only two of them now. World A is our present, world B is a fantasy-ish one which is very similar to ours but evolution has been different ...
I have a question that concerns a story I am writing and I hope it is a valid one to ask. But in my story, several groups of colonists, each arriving on different ships at relatively the same time...
I'm working on explaining away the existence of a planet whose entire ecosystem is based upon bioluminescent creatures, and I've been wondering if there could be a reason for their blood (or other ...
I recently came across Could pulsars really act as "lighthouses" to help in interstellar travel?, asked a week ago. The author was trying to figure out if pulsars could be useful for interstellar F...
I'm working on a universe where FTL exists but arrival times can be unpredictable to say the least. On average FTL trips are conducted at 4C but ships can take much longer to arrive than that speed...
On Earth life has six fundamental building blocks for life with them being Hydrogen, Carbon, Nitrogen, Oxygen, Phosphorus, and Sulfur. (1) Those elements of help make up more complex life through a...
My world - basically Earth all along, unless told otherwise - is populated by humans and few fantasy-based "races" (actually, species - any interbreed offspring, if possible, is infertile): elves, ...
Following up on my Martian canals theme from this question and assuming the canals can be constructed, I would now like to ask what level of technology is required to do that. The basic problem Th...
I'm trying to create a world that has a equator-like climate in the north pole and the same arctic south pole. I have done some research already but there are a lot of things I don't know but the h...
I've been conceptualizing a species of intelligent insects. They would have 6 limbs, they can fly, but they walk bipedally. I've been thinking of having them get down on all limbs of they need to g...
In my world there are humans who have undergone a mutation from being exposed to a certain kind of magic. They have not realized they have been mutated until they start noticing that they have the ...
I am writing a fiction set in the 'dark ages', a pre-industrial, pre-gunpowder world. On Earth that would be no later than 800 AD, but this doesn't have to match Earth. There is no magic, and I won...
Superheroes! Everybody loves them! (Though maybe not as much as magic.) The point is, I have a world with super heroes in it. I have a pretty good system of power granting, and have basically divid...
Everyone loves a Dyson Sphere or a Ring World, so much more room to enjoy than a traditional round planetoid, it's all about space efficiency for the advanced civilizations. There are however a nu...
