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This planet I am proposing is approximately half the size and mass of earth and has two moons. The moons are respectively 1/8th and 1/10th of the size of the planet.The moons orbit the planet at di...
So I decided to revive an old project which I was seeking assistance a year ago on the realism of the worldbuilding. WB links from the past: Reality of a tidally locked planet and Slowly Sculpting...
If a tidal locked terrestrial sized moon with 0 eccentricity, 0 incline, and was orbiting .01 AU away from a gas giant with 12 Jupiter masses (which would have approximately the same radius as Jupi...
One of Alice's interstellar jaunts will take her to a Gold Planet. It's a planet that was recently covered in a meter deep layer of gold dust (for realism, it is mixed with silver, platinum, teensy...
I saw this video a while ago, and recently it's gotten me thinking. Towards the end of Artifexian's video on gas giants and habitable moons, he mentions the idea of having 2 habitable moons in a ho...
My story involves a groups of colonists from a near post-apocalyptic Earth settling on a nearby, newly discovered habitable world, each colony separated and unknown to the others initially. Through...
One of my characters has hands very different to the ones we're used to. His fingers can close towards both sides of the hand, meaning that the back of his hand is also a palm and he has a second ...
To give an illustration of what I mean with downward ear, here's an illustration taken from mtrakholisova's Pinterest. I want to make a species with downward facing ears. They cannot be moved fa...
Is there any feasible way for a satellite to have a long lasting higher spin orbit resonance than 1:1 (tidal locking) BESIDES having an eccentric orbit, having its own satellite, or being severely ...
So it's been a while since I've seen the Nightmare Before Christmas, but it's come up in my thoughts recently. Or at least one specific background character. (Source) This character is apparen...
A character in my story, taking place in a Renaissance era time period, has metal bones as well as metal teeth. How would he be able to make his teeth appear of the normal white color? This is ...
Here I began exploring appearances of binary stars when standing on a planet. The planet orbits both stars. I've established through the help of this community that there are times that the two s...
The Conjoined Alliance of Space Travellers (Nope, not that one) is a generally nice completely peaceful group of heavily armed species exploratory organisation. Using ships such as the Exciting Un...
I've been pondering for some time an alternate-history story where the Earth as we know it is replaced by a Rocheworld, of the canonical variety introduced in the eponymous Robert Forward novel whe...
I think the idea of radially symmetric alien organisms is really exciting in the questions it raises about function and design. For those who don't know, humans are bilaterally symmetrical. If you...
I am running a sci-fi RPG. One of my players (the Engineer) has expressed interest in having a gold hammer. This seems pretty ridiculous to me as gold is soft and softness doesn't seem like a qua...
Exactly what the title says. I don't know to exact pH level of the water but it's at a level that it would kill a human should they drink it. What/how would a creature evolve to deal with drinking...
Heat is energy. Temperature is an indication of the level of heat in a substance. But the normal way to measure temperature is to observe how the substance interacts with its surroundings - most co...
I'm designing an environment suit for humans to wear while interacting with a benevolent alien species while in alien space. Here's my question: How much solid oxygen (by mass and volume) it woul...
I created a fantasy map a while back, but only recently have I realised it may have a major problem. There is next to no land at the equator although some land between 0-30 degrees. The vast majori...
My first time here, hope this is a useful question. Mostly about orbital mechanics and vacuum. So the crew of a general-purpose interstellar spacecraft have stumbled across a paradise planet. Afte...
Okay so there's a project I've been thinking about for a long time wherein humans colonise a world where the climate appears warm and benign only to discover that the local climate oscillates from ...
Note, when I say hydrogen-based atmosphere I mean replacing the 20% oxygen with hydrogen1. Let's just say basic plant life2 has developed on our fictional planet (which has the approximately all t...
I've been designing an an intelligent, bat-inspired avian race, and I've been struck with a question that I need answered. Now, I want to have these bats to fulfill different types of ecological n...
I need to know if it'd be possible for a underground ring-like structure of immense proportions and alien design to go unnoticed by modern day sonar, radar, and geological surveying. For an idea ...
