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I'm trying to build a designer organism that would prove a threat to all life on Earth. Sort of a semi-organic von Neumann ecology of microscopic nitrogen-eaters that rapidly consume nitrogen to fu...
What I mean is: instead of a "rat" evolving into primates and those tree hugging primate becoming bipedal great apes, imagine a "rat" evolving into a dog-like or cat-like animal, then that animal b...
In space-trading games like Escape Velocity, Elite: Dangerous & others, cheap FTL exists, but lags in other advancements results in a playable environment that is politically fractured and not ...
Is it possible for an earth analog planet* to have more than 3 convection cells per hemisphere? In our system we only have Jupiter and Saturn with 20 atmospheric bands, even Uranus and Neptune hav...
I'm curious if it's possible for human life to survive in both of the following cases: 1. A fantasy world with only sunlight (no night). 2. A fantasy world with only night (no day). Note: let's ...
I am writing a book where organ printing has advanced such that humans can grow full hands, arms, legs, and every inside organ. This process is used to "make" soldiers in Earth's future because clo...
"Group B" has acquired [Plot-device] and it is able to deliver over time infinite energy of the type needed for the story to work. They decide to place it on the most powerful space engine known t...
So for the story I'm writing, I'm designing is a gas dwarf with a very strong magnetic field and a planetary ring with a slightly inclined orbit. However, the rocks within the ring are very sensiti...
Worldbuilder in dire need! I'm trying to figure out the eclipse length of a habitable Earth-like moon that is rotating around a gas giant. The story that I work on is centered on the Earth-like mo...
What I'm doing is trying to find a way to create an atmospheric cold trap that will maintain a temperature of approximately −200 degrees Celsius (−328 Fahrenheit). According to Wikipedia In as...
I'm building a small, naturally inhabited world where usable water is scarce or difficult to access. Is it possible to have a planet with groundwater, ice caps, temporary rivers and lakes, seasonal...
Question inspired by discussion under this answer: https://worldbuilding.stackexchange.com/a/70360/2071 Dear people of Proxima Centauri. Our planet is dying. Our suns are dying. As you all know. W...
I'm working on a sci-fi/fantasy story that involves a future earth that has become tidal locked with the sun. Part of the story has an advanced civilization that has built a ring (halo) that circle...
With all the interest in VASIMR and the idea of getting to Mars in 39 days, the biggest challenge I can see is having a power source that is strong and light enough to make that possible. So I was ...
Modern education teaches citizens that the point of an individual in society is to contribute labor. In a world with limited natural resources, we use this idea to measure an individual's worth in ...
Looking at a race based on Hobbits or Halflings, and I am wondering about the average weight and if that is affected by denser muscle mass (than human children of the same height), and the realism ...
I read that our current method of cryonics involves replacing blood with other fluid and keeping the body submerged in liquid as well as on ice (these things being done to the dead, for now, instea...
So, I was looking at the temperature variations in Earth's atmosphere and noticed that it gets extremely cold in some of the upper portions. So I was wondering, could a low gravity world hold onto ...
So, as the title suggests, I have a reptilian alien species capable of human-tier thought. Anatomically, they are centaur-like (four legs on the ground, two manipulating limbs up top), standing sli...
So here's what I'm trying to do. I've got a setting that at a medieval level of technology and is rather similar to Europe with knights, castles and all that jazz. However to give the setting some...
It is near future, Portland, Oregon, and the residents and neighboring farmers are sick of everyone moving there now that climate change has made it a (even more) fabulous place to live. In an ext...
Primate evolution has led to the loss of a heat cycle. This has allowed us to have children at any time of the year. But imagine a world where humans never gained that ability, perhaps even evolvin...
Many people know that our blood is red because it is iron based. Many people also know that blood is blue or green if it is copper based. I'm wondering what color blood would be if it was let's say...
We love turtle worlds. We already have a question about turtle planets : How do I prevent my turtle from collapsing under its own gravity? but let's scale it down. I would like to have a waterball...
This is for a storyline that I have been building. Currently, scientists are able to teleport spin cubits in laboratory conditions. This is often mentioned in connection with information transfer....
