Posts tagged earth
This question is related to Deadly, Heavier than Air Gas, and Is a world with two different types of air possible? but has several different criteria. I've also looked at https://chemistry.stackexc...
Imagine a visiting alien accidentally spilled a bucket of inverse matter (a substance I made up just now) on the planet Earth and this stuff will annihilate with ordinary matter to produce neutrino...
Taking into account the some limitations of the square-cube law, biology, and aviation, I have tried to make a dragon-like creature and a hominid that participate in a symbiotic relationship. For ...
How many people can live comfortably on planet Earth, assuming that humanity reaches Kardashev scale Type I level? This implies: Energy is cheap, and available in an almost unlimited quantity, c...
So say there was a rogue gas giant about the mass of Jupiter that, unfortunately, happened to be headed directly at Earth (or at least close enough to knock it into an orbit incompatible with life)...
As a follow-up to this question, what would be the effect(s) of a high-speed of super-heated plasma entering and impacting on a planet? The planet is about the size of 1.2x Earth(s), with a simila...
The only limiting factors are that it has to be in an area near to the ocean and to mountains (Similar distance as the Himalayas to the Bay of Bengal), and that it has to be in a hospitable place, ...
How could blue soil exist, in a realistic earth-like world. The world may even be earth. First off is it even possible - could soil like this exist given the requirements below? (if not then why?)...
its my first time posting here and i hope i do it right (watched the tour and all that). I've designed a World Map and would want to know if it looks realistic like that in terms of positioning of...
On planet Earth, the capital of the Earth Sphere in my universe, in the year 2127, the population has increased(in density per area) by about 410%, due to the discovery of "key" bridges- traversabl...
Perissodactyla is an order of mammals consisting currently of the seventeen species of horses, rhinoceroses and tapirs. Usually, any clade is connected by a coupling of genetics and physical morph...
Problem statement There exists a thriving Bronze Age civilization in a gigantic rainforest, bigger than the Amazon and Congo put together. This civilization is built in on the flood plains of a mi...
For a certain reason, I needed two habitable similar earth-like planets very close to each other. After various information gathering, I gave up on double planet and gas giant moons, because tidal ...
I have a world where prehistoric humans were kidnapped and transported to another world. This other world is Earth-like, with mammals (also transported from Earth then later diversifying into othe...
Art by Sylvain sarrailh What kind of event would we need to have 1km deep fissures spanning out across the planet. I can work with a hypothetical scenario where the planet might have had some sor...
"At this very moment we face a threat insurmountable to Man. We are faced with two options. Stay on Earth and die, or leave Earth to space." - UN Preservation Council, CE 2047 Earth, year CE 2047 ...
In a previous question I asked if a world similar to that envisioned in the Mars of Edgar Rice Burroughs / H G Wells could exist? And if so would canals be a practical way to make the planet habita...
The planet has 256 days in a year, split up into eight months, each with 32 days. My planet is a bit smaller than Earth: Think, enough space for the continents of Earth's western hemisphere and th...
We all know the tale of Jack and the Beanstalk--a farmboy sells his cow for some "magic beans", which in turn grow into a mountainously tall stalk that led him to the land of a giant. Now, scienti...
The robot in question is a large, worm-like mining robot built for digging tunnels. It has electromagnets positioned throughout the segments of its body, for the purpose of pulling metals out of th...
I'm considering a scenario where Humans cannot live on Earth anymore, and need to settle other planets. Some physicist I follow on YouTube like to remind us that almost no mater what we do to Earth...
This question asks what if the world was divided into two regions? I'm asking what if the world were split into two planets. Let's say some aliens come to Earth and prank us (apparently they never...
My world is very earthlike and I am looking to create a bird that primarily eats bone marrow. I wanted my bird to crack the bones of the carcasses to eat the marrow inside. What would the ideal bea...
One thing I like about Attack on Titan are those lovely Omni-Directional Maneuver (ODM) gears! They're the perfect combination of a jetpack and a grappling hook. I love how the thrusters are placed...
Back home, Amphicyonidae (bear-dogs) predated Ursidae by only four million years. While the latter still lives in the form of eight species, the former had been extinct for two-and-a-half million ...
The main source of free energy that allowed life on Earth to develop was our sun. It bombards the planet's surface with photons of high energy, which provide activation energy for reactions necessa...
As we know, the Earth had one super continent at one point in the history of our planet, which eventually broke apart to become what we have today. Assuming we're talking about a planet near iden...
Duplicate Earth and Moon, where should I put it? This question partly arises from the criticisms of stories that claim a hidden planet obscured by the sun, how it would have been detected and if s...
I'm writing a story where aliens are using humanity like a botnet to do hyper complex calculations - each infested human has a program running in their subconscious brain that does a small part of ...
By "bryophitic", I mean "non-vascular land plants", being the liverworts and the mosses. (Hornworts are comparative latecomers, so we won't be talking about them.) Without vascular tissues, these...
Saturn has rings of debris which orbit it, and it is possible to get a satellite into an orbit that will at least last a few years, so my question is as follows; How many satellites (or just the pu...
I was answering this question about how a living planet-organism could be possible, and realized I didn't know how such a planet-organism could produce a magnetic field. I postulated that it could ...
as the title, is there a way to levitate entire body of water in earth and make it stay in the sky (not cloud and still in liquid form) ? either natural or man made. the water either flowing or c...
I am curious that if there were a gas giant sitting close to a red dwarf with an Earth-like satellite orbiting it: How could we determine the way the planet appears in the sky and the way it i...
Essentially I'm looking for a plausible way that a planet could have odd, extreme seasons. Basically I'm wondering how (or if) a planet could work that has a week long day during the summer and a w...
When one thinks of a shelled cephalopod, odds are high that the first thing to come to mind are the ammonites. They were one of evolution's success stories, thriving from 400 to 66 million years a...
Allow me to present Lyr, one of a handful of worlds crafted by artist Chris Wayan: The one detail among a vast many that is important to this question is that its salinity is about 1.5%, roughly...
In recent years, we have found evidence in the Negev Desert of the Middle East of a striped hyena, a solitary carnivoran, tagging along with a pack of wolves. This sort of alliance is found nowher...
Let's imagine a planet that is 5000 km in diameter but has the mass of the Earth. I'd imagine standing on that planet might feel similar to standing on the Earth, because the gravity would be compa...
Here is all you need to know about the creodonts: They were a group of carnivorous mammals that, despite having carnassials, had no relation to Carnivora. They were a global force, occupying terr...
So, it finally happened. The Earth was hit by a comet, and anyone outside of a research station at the bottom of the Atlantic is now dead, or dying. So, here's what we need to know: How big would a...
Can large amount space debris be used to block sunlight from falling in a particular land area (about the size of Hawaiian islands)? If so, how much space debris will be required? What will be the ...
If our atmosphere was much thinner (half as thin as we have now) how would animals and humans evolve? Would we evolve completely different? Would we have a quite barren planet? Let's just say that ...
In an alternate Earth, there are no bats. Instead, there are "flying monkeys" (which are actually lemuriform primates, rather like bushbabies or lorises.) And even though they have batlike ears, ...
Thanks in advance for any input you can provide! I have a moon called Vieneo http://www.risetvp.com/Vieneo which has some geological modelling of faults and epicenters over some range of time: ...
In the world that I am making there are hollows all over the planet, which are massive underground subterranean areas of the planet. Think The Hollow of the Gears Of War series. So far the going th...
In an alternate Earth, a mass extinction wiped out a percentage of the most successful phylum ever--Arthropoda. All that survived of the class Arachnida were the really small varieties--the ticks,...
My world is set in ancient times on a planet similar to Earth, but with a different civilization and different geography (and lots of canals). I need to find a way of giving the inhabitants better ...
How would human culture and civilisation develop if placed onto a planet permanently psychoactive, e.g. because of low (but inevitable) amount of LSD-like substance in either water or air? To simpl...
My story takes place on the moon of a large gas giant planet. I have been trying to decide on a way for the moon to be as Earth-like as possible, but I have now decided to ask the community for hel...