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Doing research into my time braking world I was referred to Split Second by Douglas E. Richards. It turns out he conceived of the exact same machine that I did, however he handled the paradoxes dif...
In my story, a ship is built in orbit around Earth, designed for a 20-person scientific expedition to a planet 11.4 ly away. It will accelerate at 1g for half the distance, then flip around and acc...
I want to send a flying saucer (a $\frac{1}{10}$ scale Independence Day City Destroyer - calculated as a sphere cap 112m high with 1.2km segment radius, $\rho$ about 43.3kg/m3) away from the sun as...
In FTL-free universes, interstellar travel is often done by vessels capable of continuous acceleration (the drives themselves are often magitech), which can use the effects of relativistic time dil...
What would be the approximate gravity, atmosphere etc. of a planet for a species to never make or use launch vehicles with rounded shapes like tapering cylinders, because they make use of the incre...
Let's say our villain fires an antimatter rifle from behind a magnetic field over a km from the target. The bullet is traveling over 1000 meters per second. If it reaches its target, the 13 gram bu...
In my scifi setting small utility robot swarms are used for many purposes. I'm currently trying to estimate how much energy such a swarm would need to operate. Since biology, robotics and nanotechn...
I came across the design of a nuclear pistol from a deviantart artist, shown here: I want to know if this can actually be built. My additions: The "egg" needs not be uranium, which has a huge ...
Time traveler here, stranded in the year of 1019 AD, medieval ages. Location: europe. While I can still access and post on web forums because my temporal transmitter has a 1Ky range, I have a broke...
I have seen many people discuss in this community on how a plasma gun ought to be made. But only a few mention the Powergun from the Hammerverse. I ask if this design will work. Can the bullets ...
After what feels like forever and after asking several questions (like this, this and this), I believe I may have decided upon a suitable orbital system for my world: $M_{S}=2.272\;571\;144\;5 \...
A squid-like organism uses gravity powered flight but relies on jet propulsion for launch, pouncing, and evasive tactics. It's aerodynamically based on the way a true squid flies however it has ev...
Amide bonds are extremely stable and their half-life for hydrolysis in neutral aqueous solution is estimated to be seven years. Amides bind to metal ions through the carbonyl oxygen. Neodymium Mag...
NOTE: If there is anything about this question that needs clarification or editing, please don't hesitate to let me know in the comments. Get ready, because you're in for quite a ride. I have t...
A scientist is resetting the clock on his microwave one day as he considers the hopelessness of keeping the time exactly right. Not for the reasons we worry about like power outages and daylight s...
The Breakthrough Starshot is a method of robotic interstellar exploration by launching thousands of small centimeter-sized probes, each equipped with a 4 x 4 meter light-sail. Thanks to their small...
I wish to create a world such that it can support the following plot point: the world experiences gravitational waves that are directly noticeable to the human population (i.e. they can feel or see...
Which minimal order of magnitude is required to simulate single cells and microorganisms in cyberspace? In an utopian future, people will be possibly able to rapidly design new cures, be their rea...
There are 2 planet sized structures that are artificially made with no means of propulsion. Each structure has the approximate mass of Earth but are hollow inside. The inside area is where the peop...
Working on a D&D campaign. As a physics nerd, I'd like the orbital mechanics of the planet, its sun, and its moons, to follow standard Newtonian/Keplerian mechanics. I'm trying to come up wit...
Short question: which hormones should high contagious fungi spores produce to make their human host spread the joy and infection (by hugging and kisses) on early stages of infection, and become p...
WARNING: This post contains some spoilers for the anime/manga Dr.Stone. As I'm watching Dr.Stone, I see Senku and the gang trying to make vacuum tubes for their circuits. The vacuum tube is an anc...
I am wanting to make a 3 world lagrange system around a Sol analog star that includes 1 gas giant and 2 terrestrial worlds with large moons. I want the terrestrial worlds to have a similar gravity ...
So, one of my D&D characters has a cut/relief-carved quartz crystal amulet (medallion shaped) that's both an arcane focus (crystal) and a holy symbol (amulet), and I thought it would be a good ...
There are a whole bunch of different ways to determine the thickness of a planet's ice sheets; over the decade, dozens have been tried on Europa and other icy bodies. Broadly speaking, as we're wor...
