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I have two planets that are the exact same size and mass of Earth. They orbit each other, and have an orbital period of one day. How far apart are they? The planets both orbit a star the same as t...
I wrote a novel based on a human civilization that lives floating cities and dirigibles on a small, atmosphere-abundant super-Earth with a liquid water core (there's a smaller solid core under that...
This question discusses what you'd look at from space, but mostly focuses on how you could identify the weather. This question discusses what resources a colony would need, but doesn't discuss ho...
I ask because I have a problem trying to find an appropriate launch window around that time or any point in the mid-1980s, and I need to reach Jupiter via Hohmann transfer so I can then use a serie...
I'd like to justify a lightning man in my world, and I have a theory that by some sort of magic, his cells in the dermis (middle layer of the skin - okay, for simplicity, don't count hair) are able...
I know the innate contradiction present here: one cannot "prove" the supernatural exists, for a variety of reasons. But for the sake of argument I want you to consider this: A person is convinced...
Scenario: I have a generation ship moving between two star systems. Given that such a ship needs to have a completely self sufficient life cycle system to make it viable, ejecting mass continuously...
What kind of system using modern technology would be able to counter a railgun projectile on a vehicle (both land and sea)? Would a think slab of angled armour in the shape of "<" work to cover ...
I'm trying to design a realistic genetically engineered nanotech super-soldier with a full set of redundant organs. How much more interior volume and thus height/weight/muscle mass would a human bo...
After watching this brilliant video by Shoddycast about Stimpaks in the Fallout universe: https://m.youtube.com/watch?v=CLY-FMxsb2U I started to wonder. Just how many of science fiction's most me...
So for my story I want to have a binary planetary system, where both planets are about the size of earth and are habitable by human people. I'm also thinking that they will be tidally locked to eac...
Our intrepid interstellar crew arrive in a new solar system. The find a planet in the Goldilocks zone. However the planet has no life, but is otherwise earth like*. The atmosphere is 80% nitrogen, ...
I've seen a couple questions before (like this one and this one) that ask about the habitability of a planet, with a key part of that being if the atmosphere is survivable. It seems like we should ...
There are a number of stories about persons with exact look alikes. In general this seems to be a rather rare phenomenon. But if you assume more and more humans it should become also more likely ...
In his Robot Series, Isaac Asimov mentions "yeast substitutes" as a way of creating enough food to feed everybody in the Cities. It's also mentioned in Prelude to Foundation. Here's a few quotes fr...
If so, what's the equation (or series of equations) for this, and what variables do I need to take into account? EDIT: the planet in my setting is rather "chilly" (around 9.35 Celsius average) wit...
Simplifying a larger problem. Building a sci-fi text game and I don't want the science to be too wrong. Imagine I have two points in space which are 111,125 kilometers apart and it takes 17 minut...
This is a rather nasty, if rare, brain-eating thermophilic amoeba which lives in warm waters in North America (and elsewhere?). It kills by infecting the brain via the olfactory nerve after it ente...
This is the Bering Sea today... ...and this was the Bering Sea as recently as 25,000 years ago. Truth of the matter is, the Bering had been shifting back and forth from land to sea for 100 mi...
I was wondering if it is possible for life to evolve in a world which lacks any transition metals. I am wondering this because, it could give a plausible explanation for a world which is very unli...
In the event that MOST of the world population were wiped out in a plague / apocalypse that did not directly destroy infrastructure, just killed the people, how long would infrastructure like the p...
Anyone who has a well-versed background in geology will know that the rock of the continents is granite. It forms as lava cools down very slowly, creating large minerals and crystals that shield...
Recently, there have been some great questions pertaining to monomolecular blades and filaments, so I wanted to ask two very essential questions. If we can't definitively answer these, we can never...
Guests of this large space station enjoy Earth-like gravity (80-90% minimum). How? Well the space station is so massive it has its own gravity. The disk shaped "core" is made with ultradense mater...
Think of a giant hemispherical shell, constructed of spaceships, sitting just far enough from Earth to be too far for Earth-based defences and close enough to effectively cast a shadow on the entir...
