Questions tagged [earth-like]

For questions regarding planets similar to Earth in most respects. This tag should be used when describing a planet that follows the rules of Earth with exceptions outlined in the question. Usually questions using this tag will be about the differences and the impacts of those differences.

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What is the maximum percentage of sky that could be covered by a super-Jovian world?

Puffy Jupiters can be huge but the Kepler data suggests that traditional super-Jovian worlds nearer the goldilocks zone, or farther from their parent star, only reach about 10% larger in diameter than ...
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Could the differences between day and night on this desert planet allow for strictly nocturnal condensation?

Here's the basic gist of this (debatably) habitable Earth-like desert planet: Size: Same as Earth Rotation: 30 hours (three extra hours of daylight followed by three extra hours of night) Revolution:...
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What is the habitability of an Earth- like habitable planet that do not have any cloud covering?

Let's say I imagined a world that is as habitable as Earth and has the same oxygen levels, land to ocean ratio and similar average temperature. However it has no clouds at all. How different its ...
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1answer
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How many co-orbital Earths can we fit and NOT get them tidally locked?

According to Sean Raymond, a co-orbit of six Earth-sized planets, separated by 60 degrees of space, will stay stable for millions of years. And in his latest blog, he has gone a bit further and ...
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4answers
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What Could Create the Remaining Two Types of Single-Biome Planets?

There have been numerous questions in this SE about single-biome planets popularized in the Star Wars mythos. Despite the criticisms, these worlds are plausible, and they all involve the right ...
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1answer
63 views

Convection Cells in the Atmosphere of a Jupiter-Sized Planet

Background The setting for a story I am creating is an earth-like planet near jovian surface area, existing in a universe where the force of gravity is appreciably weaker than in our own, such that a ...
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2answers
185 views

I need help with my ocean currents

I haven’t really ever gotten this far in worldbuilding, and I’m kinda stuck on ocean currents. My world has lots of tiny little islands that are on 2 slightly submerged continents (around 3 metres ...
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4answers
86 views

How will seeded Earth life adjust to a tidally locked, Earth-sized moon?

Starting in 2017, a worldbuilder by the name of Dylan Bajda conceived a new twig in the speculative evolution branch of the science fiction tree: The seedworld. The twig was called Serina: A ...
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Consequences of a Super-Light Super-Earth?

In this scenario, there is a rocky planet that is 230% the width of our Earth, covering a total area of a billion square miles, 55% of which consists of three continents separated by a single ocean ...
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2answers
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Picking skin/fur/scale/feather colors in the light of a white sun (F-star)

As I have been developing my world, namely a massive moon (0.9 Earth masses) oribiting a gas giant (about 3 Jupiter masses), I have confronted multiple times the question of what colors should the ...
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3answers
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Additional applications for advanced airships in my earth-like world

Recently I have asked a question about assessing the viability of airships in the scenario of my world, concentrating mainly on their usage as cargo haulers. The answers have been pretty positive and ...
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4answers
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Can an Earth-like world of shallow, global, seas be stable over geological time?

The following existing questions Shallow sea world - plausable geology? Would a shallow ocean planet be possible? both address shallow seas on Earthlike planets but don't touch on global oceans of ...
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3answers
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how do you freeze an ocean to get a desert planet?

So I'm in the middle of writing my desert planet, let's call it Thermos for now, and I'm having a bit of trouble balancing some aspects which I'll get to later. Thermos is an earth like planet with an ...
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1answer
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What material could be found (Mining) on this planet? What could I do to have more important materials on this planet?

The planet is Earth-like with gravity: 1.05 Earth's, an Atmosphere of N2: 94% / H2O: 1% / CO2: 1% / Ar: 3% / 1% Other gases with 1 atm pressure at sea level, 40% of the land is H2O water, there is ...
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1answer
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Can a planet bigger than earth exist with same density but with more water proportionally and a lighter core?

By bigger, only the area of the crust is necessarily bigger. Core is necessarily lighter. Everything else could vary. Can it hypothetically exist?
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Vegetation on medieval farmland abandoned for 40-80 years

What kind of vegetation may I expect to encounter on a farmland that was abandoned partially about 80 and completely some 40-50 years prior? This is medieval-style farmland, so it is not wheat for ...
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2answers
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How would a planet's (human) life adapt to inconsistent night duration?

I realise this question is rather broad, so I'll do my best to narrow down what I'm looking for as much as possible. The big idea The full daylight cycle on this hypothetical planet is consistent in ...
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2answers
104 views

Is it plausible to have a double-planet between a gas dwarf and an Earth-like planet? if so, can the Gas dwarf protect the planet from solar winds?

In my story, I plan to make a double-planet between a gas dwarf and an Earth-like planet, so is it plausible in a red dwarf or Ultra-cool red dwarf system? and if so, could the gas dwarf protect the ...
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577 views

Is a super-Earth with the same gravity as Earth possible?

I'm helping a friend construct a fictional planet for a project, and we've run across a problem. He's looking to create a planet nearly identical to Earth, except only larger. It would need to have ...
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1answer
141 views

Planet enabling societies evolving separately and suddenly comming into contact

I'm working on a planet design which makes it feasible for several human-like societies to emerge and evolve separately, up to a point where they are capable to interact with one another directly with ...
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1answer
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What would a Haumea-shaped Moon look like from Earth?

Basically what it says on the tin, I'm writing a fantasy world and I'm testing some exotic types of moons for this one. Then I came across Haumea, a dwarf planet located beyond Neptune. Quoting ...
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1answer
129 views

Cutting off a chunk from the north [closed]

I want to make a map of a completely made-up world; the main issue is the island of the elves. According to their history, a piece of land floated away from the north, and then the "water people&...
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What would weather be like on a smaller Earth that has the same surface gravity?

First, let me state my current understanding of things (with the help of Universe Sandbox), just in case it is wrong somewhere and thus my question is wrong: To have the same surface gravity as Earth'...
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2answers
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Fake, Heatless Sun-like object hovering over a person on Earth, how deadly it would be?

Above the Crimson King in my story is a sun-like paetheon-sized asteroid (5.8 km in diameter) that follows him and never sets. This is not an asteroid actually but i call it false sun and it appears ...
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Are there any rules of thumb to predict which waters should have frequent storms on a fantasy map?

In RL there are areas more likely to have storms which affect ship design (and in premodern era routes). Are there any rules of thumb to predict which waters would have frequent storms on a fantasy ...
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Help with my ocean currents

First off, I'm really not good with designing ocean currents (I find the topic confusing and hard). But for my world which is basically just earth over 100 million years in the future, I need to ...
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7answers
2k views

What is a proper River Horse?

In a pre-industrial human culture on Earth with slightly altered flora and fauna, where rivers and canals are the major ways of transport, how would an ideal and realistic animal replacement for ...
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Does twice the planet radius mean two bands of desert per hemisphere?

Earth has three convection cells per hemisphere, resulting in each hemisphere having a band of desert at the end of the Hadley cells. Given a planet with the following characteristics: Twice the ...
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How do storms scale with planet radius?

I'm trying to figure out how weather scales with planet size, keeping other factors constant. For a specific example, say a planet with the following characteristics: Twice the radius of Earth. ...
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5answers
213 views

Secondary moon with negligible effect on planet

I'd like to know how to set up a secondary moon for a very much Earth-like planet that I could use for religious and time measurement purposes in a novel but that would not change general situation on ...
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3answers
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Natural door-furniture for wombat-poop architecture

Real life It is a biological fact that wombat faeces are approximately cube shaped. Wombat poop: Scientists reveal mystery behind cube-shaped droppings It is also the case that wombats tend to make ...
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1answer
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What Would the Sky Look Like If the Sun Were a Different Color (And Still Half a Degree Wide)? [duplicate]

This question has been asked many, many, many times--what would the sky look like if the sun were a different color? But the mistake I keep seeing is that they used actual stars and imagined Earth as ...
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1answer
103 views

A planet with flying witches on broomsticks - or are they?

NOTE My question is different from this previous one. What could be the physics behind witches flying on broomsticks? It is different because the phenomena in my question are not actually witches - ...
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How would two moons in horseshoe orbit impact calendar development? [duplicate]

I've decided that the habitable planet I'm writing will have two moons in a horseshoe orbit, and I’m trying to understand how this moon configuration would impact the development of a calendar system ...
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1answer
164 views

Two large moons in horseshoe orbit possible? What effect on humanlike life?

I've decided that the planet I'm writing will have two moons in a horseshoe orbit, closely modeled off of Saturn's Janus and Epimetheus. For the purposes of this question, I'll be calling them Moon ...
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5answers
506 views

What percentage of NPCs does a god need in order to remain benevolent?

A god (G) of an Earth-like world is benevolent. At the same time G allows free will. The problem is of course that some people will choose to harm others. This presents the god with a problem; how ...
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3answers
161 views

Making ice in the tropics

My characters live on a tropical island on another planet. Although civilized, by their standards, they have not been through an iron age or bronze age since the metals oxidize when exposed to their ...
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6answers
3k views

How Big Can a Habitable Planet Get Before Its Gravity is More Than 0.8 m/s² above Earth's 9.81 m/s²?

This is NOT a repeat of this question. I am NOT looking to see the smallest planet possible that has less gravity than Earth. I am looking for how big a perfectly habitable planet (Habitable meaning ...
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1answer
206 views

Climates of a Eurasia-like continent in the tropics

I'm working on an earth-like world that has a two main continents akin to Eurasia+Africa. but centred on the Equator. Basically, the premise is to shift the east-west axis of diffusion that exists on ...
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3answers
230 views

What would Earth look like if its rotation was inverted? [closed]

Let's say we are in a parallel universe: we have an exact copy of our solar system, galaxy and so on. The only difference is Earth: it rotates on its axes the other way around (to be more clear, in ...
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7answers
2k views

Physical explanation for a permanent rainbow

I am trying to create a world where, on a Earth-like planet, a certain area experiences a peculiar phenomena: year after year, in a given period of the year, for a certain number of days (greater than ...
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1answer
96 views

What type of biological changes would need for animals to move earth-like on a terraformed mars?

Assuming Mars was successfully terraformed. It has earth-like atmosphere composition and density. Plant life is abundant. My question is what type of biological changes animals (and birds; not humans) ...
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2answers
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How to model an earth-like planet with extreme winters in the northern hemisphere?

I want to create a planet where there are extreme winters (3 months with temperatures up to -40°C) at around 50° latitude. The summers are just slightly hotter (a day of 30°C in the summer would not ...
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1answer
131 views

How would monsters realistically exist in our world? [closed]

How would monsters exist in real life? Setting: The world is like ours, but with some changes. The geography is as if the tectonic plates did a different thing, the plants are similar but there also ...
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3answers
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is there any way to make an earthlike planet (aside from the atmosphere) have a green sky at noon and a pink sky at dusk

im working on a mostly earthlike planet (aside from atmosphere) have a sky that looks green at noon to humans and pink during a sunset? could it be done via airborne algae? would the atmosphere still ...
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1answer
137 views

Alternative earth-like planet environment that supports human life

So i want to create a planet that supports human life. Primarily, i would need to consider a star type, an atmosphere, foliage pigment, and potentially different types of plants. Think of it as a sort ...
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0answers
130 views

Effects of a large, equatorial freshwater sea on the surrounding ecosystems [closed]

So, first let's imagine an earth-like planet (roughly the same size and axis tilt, presence of a moon, etc). The majority of the landmasses on this planet are in the southern hemisphere, and unlike ...
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2answers
154 views

How to reduce the greenhouse effect while keeping the same amount of CO2?

So in my story, a group of people must colonize a planet that is habitable with a lot of sources of water and oxygen, and they need the right temperature, but I wasn't able to calculate the Greenhouse ...
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3answers
122 views

Damage estimate for a large acetylene explosion

In a laboratory in a university building, a gas tap is accidentally opened at the end of the working day. The gas tap is connected to a bank of large acetylene cylinders. The gas tap is ejecting 0....
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13answers
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If you lived 5,000 years, would you notice the continents moving?

I am trying to develop a story where it is based on Earth around the 42nd century and can't figure out if the continents would have made any noticeable/notable shifts. Any help is appreciated. Edit: I ...

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