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I have a planet around 11242 km in diameter. It is very similar to Mars, with most surface water trapped at the poles. For this, I want the polar temperature below 0 C, but the equatorial temperatu...
In many sci fi universes that don't have handheld energy weapons, they instead use solid projectiles that either go big (Warhammer 40k) or really small (Mass Effect). The former I have a pretty go...
Assuming all the primary hurdles in building a space elevator are overcome, would it be structurally feasible to attach intermediate stops along the length of the tether (between the planet and GSO...
So far I've been using Artifexian's How To Build A Star YouTube video. The problem with this video is that it's quite old and thus outdated. The things I've noticed to be particularly weird are the...
So the mass of air around the earth has doubled. How it doubled isn't part of the question, but for the curious let's say a space station floating around earth processed all the nitrogen, oxygen, c...
Sort of two questions here, but very related. One about whether a mammal-like animal could evolve to have a chitinous endoskeleton, I guess. Then a question of whether, if they grow horns, that ske...
Due to reasons of magic an alien god that is about to takeover the earth in one year and can only be stopped by being shot through the entire earth. Assuming modern day Earth (no magic other then ...
Let's assume a world where humanity managed to stabilize the climate again and maybe even reversed the effects of the current climate change. (So that we can ignore the current global warming in th...
For the purposes of my story, seen here someone who went through a similar procedure involving parallel dimensions (see here), becomes nearly indestructible , invulnerable to damage related to exce...
I agree with Tim B's assessment that this is a complicated question. However, I disagree on just why this is the case. The characteristics of the star are well defined, given that it's a solar anal...
Late answer, but another possibility... The kind of spud guns I've seen around here didn't use compressed air, but instead used a flammable liquid/gas like alcolhol or aerosol hairspray to propel t...
This is essentially a partial answer, insofar as it's a series of loosely chained together critiques. Sometime in the future, I'll revise it so it's more organized, but for now, it's a work in prog...
So as others have said, air is a poor conductor of electricity compared to water, and so you would need unrealistic levels of electricity to make this work. Most super powers are essentially magic...
Using Kepler's third law, I get $$a=\sqrt[3]{\frac{P^2G\times(M+M)}{4\pi^2}}=5.32\times10^4\text{ kilometers}$$ where $a$ is the semi-major axis, $P$ is the time it takes the planets to orbit each ...
A remark at the beginning: In a world where real-life vampires existed, there would certainly also grow a lot of myths about them. So we would have to distinguish between in-world real traits and i...
First, let's look at the different types of trajectories a solar sail can take. They differ mainly based on something called the lightness number, $\beta$, which depends on the composition and stru...
Thermal convection is your friend By heating air in the center you can draw air down from the sides. Because of thermal stacking, thermal power generation towers can be as tall as 1000 meters.
Wikipedia gives the formula for the tidal heating $\dot{E}$ as $$\dot{E}=-\text{Im}(k_2)\frac{21}{2}\frac{R^5n^5e^2}{G}\tag{1}$$ where $R$ is the radius of the satellite, $n$ is something weird cal...
Apparently, this was investigated by NASA in the early 2000s in what became known as The Caves of Mars Project. Its goal was to find possible places for humans to live over extended periods of time...
Models of such planets exist, courtesy of Unterborn et al. (2014). They discuss planets of similar composition to yours - looking at the value of the mass fraction given by $(\text{Mg}+2\text{Si}+\...
Your main problem is that the planets will comprise a chaotic system. This is why the stability of the Solar System is so difficult (possibly impossible) to determine. Our best models are valid for...
I decided to start answering this question by building a galaxy (well, a model of a galaxy, but it sounds cooler the first way). A lot of research has already been done in this area, specifically, ...
This is a classic problem in electrostatics - that is, in an analogous situation where we care about calculating the electric force on an object inside some cavity. The same solution technique appl...
@M_A_Golding notes: An objective outside observer might consider orcas and other cetaceans to be intelligent beings This suggests another possibility. If you can engineer "humans" with alien ...
This is based off the information found in the link provided by Juraj. The answer is 2,862,106 earths in the goldilocks zone How to get 2,862,106 earths in habitable orbits: Rules, they have to a...
