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I have, what I hope to be, a fairly simple question. I am designing a planet where there are no carnivores. Assumptions The creatures would all be very complacent and would feed and live in v...
Lets say there's a super earth orbiting the sun at 3.00 AU, how thick would its atmosphere have to be to trap enough heat to make the planet warm enough for liquid water to flow on its surface?
Basis We are in the universe we call our own, on the planet we call Earth, in the physics-set and known reality we assume. There is no flat-out "magic" or other things along those lines, so far a...
I know water would be out of the question, but what about liquid nitrogen or liquid hydrogen, Would silicon work instead of carbon?
Assuming these vampires are genetically altered humans and not undead humans. What biological structure changes would you need to make vampires with the following parameters realistic. Abilities:,...
In the book The Host by Stephenie Meyer, a parasitic species (Souls) attach to the back of the spinal cord of alien creatures to control their brains, but I find this a wee bit unbelievable. As it ...
Merfolk can be easily described as humans with the lower half of fish. On this site we have discussed; How their tails work, How they sleep, And how they hear. But there is one question that has no...
Split out from this question since it was too large. I'm designing an exoplanetary system that was the victim of a drive-by super-Jupiter ejected from a nearby supernova that crashed into the syst...
I have a terrestrial moon that I would like to have spectacular and frequent lightning storms. What atmospheric compositions and conditions could cause this? Tools The moon orbits a 21 earth-mas...
Setting: Modern day Earth, no special technology advancements. Situation: On day, in a relatively populated American city (the specific city is unimportant...the purpose of this point is that it's...
There is a species that is quite sentient. Its members know about the world, they have hopes and dreams and great aspirations of what they might do with their lives. They are intelligent, creative,...
In my world there are ''angels'' which have 4ft long wings and can't fly. As of late, these 'angels' have been hunt down and they must hide. How can a winged human hide their wings?
How would I change the evolution of humans to result in horns on humans as a result of reproductive fitness, instead of social fitness. Meaning, NEITHER "Horns are sexy", or some strange infection....
I am wondering if alien race detecting our signal could actually understand such broadcast. But for my story, I need the aliens being unable to understand what we are broadcasting. How can I achie...
In a world I am working on, I have a wilderness-living, social, group-living species that for various reasons lacks access and ability to anything resembling modern medicine, including vaccinations...
I am currently focusing my worldbuilding efforts in designing a story (or, perhaps, if all goes well, a series of stories) that take place in space. In my constructed reality, there exists a mater...
There was a question on here a while ago about lighting a massive Dyson sphere, that has gotten me to thinking. Obviously, such an item needs some unobtainium to build, but ignore that. I'm figur...
I was thinking about how there are some instances of convergent evolution between marsupials and placental mammals and was thinking about a parallel universe in which there is convergent evolution ...
Parasite are very unusual creatures, their entire livelihood relies on an unwilling host to allow them to live, some parasite even control the creature itself! Despite this, to my knowledge, there ...
I have a planet in a solar system that is for all intents and purposes identical to ours that I want to play like a bongo drum with asteroids or other extra terrestrial rocks to destroy most of the...
In my universe there is a human civilization that is advanced enough to have computers, computer networks, and robots, however they have a relatively rudimentary knowledge of medicine/biology. The...
In the animated movie Monsters Inc. the monsters which populate the universe all look very different despite the fact that they are presented as being the same species (since they can interbreed). ...
I've come up with a couple of exoplanets for a story, and have reached the limits of my knowledge. I've googled around, and I had a space enthusiast friend look at them, but he freely admits that h...
I've come up with a couple of exoplanets for a story, and have reached the limits of my knowledge. I've googled around, and I had a space enthusiast friend look at them, but he freely admits that h...
I plan to make a RPG setting and I want it to be as credible as possible. By that I mean that I want to be able to explain everything with science without cheating. Statistically not likely but pos...
