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So Earth has just suffered a horrible catastrophe and most of civilization is back in a Middle Ages level of development. A few people live on other planets relatively unscathed, with highly advanc...
How probable is it that a gas giant planet made of "air" (roughly the same composition as Earth's atmosphere) could exist? What would it be like? How would it differ from Earth?
This question is partly a nod to the current fortnightly challenge. In many fantasy settings and resources, there are creatures capable of, or described as, breathing lightning. How might a creatu...
The character is badly concussed, unable to stand straight, with nausea, but worst of all, unable to think straight - and he has a critical knowledge / mental skill, urgently needed at the moment. ...
A recent question concerning generation ships made me come up with a rather original alternative in my answer. It was pointed out that the concept of embryo space colonization has already been thou...
The Question about the blockade of en entire star system makes me wonder: How would, if possible, a space "radar" work? Or how would you scan for Ships further away than your Optical sensors can ...
Inspired by this article about the recent discovery of a subsurface ocean. So now we know it has a liquid water ocean and a magnetic field. The subsurface ocean is also protected from radiation by...
Back in the days when men were real men, women were real women, and small, furry creatures from Alpha Centauri were real small furry creatures from Alpha Centaury, an obscenely rich woman decided s...
On Earth, tides generally tie to a 12 or 24 hour cycle depending on the location. The exact times and heights are generally based on the shape of the sea, and the positions of the moon and sun. W...
I created a humanoid race called Lantoms for a fantasy world. They are about five feet in stature, have angular body parts, and an extra pair of arms. A layer of skin is attached to the arms, easie...
Let's say the dots on Ceres are abandoned alien outposts. Within the next 40-200 years humanity manages to send a team of research scientists to the location. The scientists quickly found a way ins...
I have an area of my world that is essentially a large crater. It is a huge barren land surrounded by mountains. The ground is stone, then below are underground rivers, and below those are pools of...
Scenario: Earth men colonized a terraformed planet orbiting Alpha Centauri. There are already industries developed there, farms, mining etc. There's a large fleet of cargo ship capable of reaching...
Scenario: Earth men colonized Alpha Centauri. Barnard's Star is at range. There is a huge fleet of fission bomb pulse propulsion cargo ships. Given Enough time and space they can reach 0.8C. Qu...
OK, so scientists have found a great new substance: That substance makes you think ten times as fast! The advantages are obvious. However, as every medicine, this pill will have side effects. Ther...
Archimedes claimed that he would lift the Earth if he could find a suitable place outside it, with his knowledge of mechanics. So, my question is: What kind of set-up (e.g. how large lever or how ...
A super alien warrior goes training inside a gravity room. It's a room with a flat floor, but the surface gravity of the room can be modified at the push of a button. But under general relativity ...
In the universe that I'm creating, the earth has been destroyed by nuclear wars fought by human kind. Nearly 98% of the population has been wiped out. There exists a society of technologically adva...
Humans developed a new weapon: Black hole launcher. How it works: A mobile particle acelerator acelerates two particles to huge speeds and collide both. A mini black hole is created. The mini b...
The scenario is that it is a post apocalyptic world where the most of the humans have been eradicated and the sources of energy have been completely depleted. In this scenario, people discover an a...
OK, so humanity is going to space, and they are going to take farm animals into space, not only humans on earth value meat, but humans in space do, too. However, they don't want to waste precious r...
Our hero is a normal teenaged boy, living in north central California. Somehow he gains the ability to manipulate heat. My original plan for his origin was a "freak snowboarding accident involving ...
We are an interplanetary human empire at war with an alien species. On the brink of defeat, this alien species designed a virus to turn the tide of war. This virus is airborne and highly contagio...
And what would be needed to expand this effect, scaling up to the size of a city, or maybe a country? I've seen this question, and it seems that while one could do it with gravity, the effectivene...
My protagonist, let's call her Alice, must acquire a priceless artifact, located deep inside an ancient temple. If this were a ruin, the exercise would be academic, but the Temple was protected b...
