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Currently, Earth's eccentricity (orbital shape) is 0.0167086. Zero is a perfect circle whereas One is parabolic escape orbit and any greater becomes a hyperbola. And in the theory of the Milankov...
Is it possible that subterranean caves do/have existed on Mars? We know of the past existence of water on Mars. Which region (if any) of Mars would we likely find/expect to find a cave system bel...
In my universe, gravity varies with the inverse of the distance (instead of the inverse square of the distance). I already know that this means that all circular orbits around the same object will ...
Mars has a couple of problems with regards to colonization such as lack of atmosphere, lack of magnetosphere, weak sunlight, and a few others. Of concern in this question is how to shield human col...
A Kardashev Type III civilisation has need of a long-scale timepiece, and as such has arranged a series of planets around a black hole such that their orbital periods can be used to tell the time i...
In DC's TV-series (and comics), Barry Allen is The Flash: a superhero powered by the speed-force. This speed-force allows him to move incredibly fast, can be transferred to others, and there also e...
When thinking about a potential answer to this question about preventing flight in a cyberpunk dystopia, I had an idea that I do no possess sufficient knowledge to prove/disprove. Thus you'll be t...
And how much fuel would you need to carry? I'm trying to determine what kind of engine you'd need to accelerate a good-size spacecraft (thousands to millions of tons) at a constant 1g in a race acr...
I know that moon composition and atmosphere (if it exists) will influence how reflective a moon is, but I was hoping for a fairly exhaustive list of materials that moons are actually made of, how r...
I'm currently working on a Sci-Fi setting for my friends to use in a campaign (my friend is GM but he's too lazy to come up with a setting so I offered to do it), I've already worked out the minor ...
In an effort to reduce the murder rate I want to greatly increase the chances of getting caught. To do so I invented a device that will record your last words (and potential the murderer's and your...
I was thinking about making up a visor like Batman has in the Arkham series, where he "analyzes" a sample and then he can set a filter on his visor for particles of that compound. Something like a...
Planet has these characteristics: Half of the planet is always on day, and other half is always night (it rotates at the same velocity as its orbit) There are no underground water sources; it's a...
In recent years, we have discovered exoplanets that defy our traditional perspectives on how planets work. WASP-17b is twice as wide as Jupiter, yet half as massive, probably because of its orbita...
66 million years ago, a space bomb ten kilometers, or six miles, wide raced through the atmosphere at 20 kilometers per second and landed on the Gulf of Mexico at an angle of 90 degrees. The resul...
A targeted hard-science spin-off from this question: In a tidally-locked planet that rotates about a barycentric point that's located outside of its own sphere, what would the coriolis forces be l...
In my setting, a permanent "fog" hangs over the ocean. It is thick, granting low visibility to anyone within it. Instead of water droplets, however, this fog would consist of some substance or comb...
Bob the time traveler has a problem. He went to 75,000,000 BC to get some dinosaur eggs (don't ask) and his time machine re-combobulator broke and a big chunk is missing. Fortunately he can still ...
Currently writing a scifi novel and am trying to do the math to establish time frame of the lore. The main points are that in 2068 CE Earth sent a generation ship to colonize Proxima Centauri. They...
Today I visited a two hours long organ concert (man, it was amazing) and weird idea have popped up in my head: organ powered by steam instead of pressurized air. This also made me thinking that it ...
I'm working on a story involving humans looking for another habitable planet, and I have been scouring the net for days, finding lots of info on varying levels of oxygen and nitrogen, but none that...
I've read all the related questions on here and as far as I can tell this should be breathable on my planet Liskuel, which has 1.5 bars of pressure. However, I'm really bad at maths and don't reall...
My (your) goal is to melt several tons of snow and ice in a small area using electromagnetic radiation beamed down from a spacecraft in orbit. The atmosphere that's in the way is vaguely Earth-like...
The black hole question reminded me of an idea I wanted to implement at some point in a space campaign, but didn't go forward with because I was unsure whether it's merely statistically very implau...
What sort of force would a railgun need to produce to have a measurable affect on the trajectory of a large spacecraft? In the scifi book I am working on the primary craft of the story is a milita...
