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 would the climate of this map look like? [closed]

In this scenario, there is a binary star system comprised of one naturally-made star and another made by the hands of some mysterious hyperadvanced civilization. The latter is a white giant, an ...
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2 answers
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Could a binary star system support life?

If we take an earth-sized planet with similar atmosphere, and put it into a P-type binary orbit, could it sustain human life? For sake of clarity, assume both stars are G-type stars and the planet is ...
9 votes
3 answers
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Detecting offworlders with cameras

There is an Earthlike planet inhabited by Earthlike lifeforms including beings that are human for all practical purposes. The primary visible human civilisation is roughly equivalent in technology to ...
2 votes
1 answer
62 views

How would the synodic period of Venus change if both Venus and Earth were moved equal distances away from the Sun? [closed]

Let us say that Earth and Venus are both moved 10 million additional miles from the sun. How would the synodic period of Venus appear to change for an observer on Earth? If 584 days is Venus' current ...
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3 answers
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Given that an ocean did not touch the ground, how would the way waves function change? [closed]

The Premise An earth-like world (gravity, 1 moon, distance from star) Oceans do not touch the ground (ignoring the how for this premise, but for consistency we'll say it's floating atop 1 km of air) ...
0 votes
1 answer
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Environmental effects of a supervolcano eruption

Background: In this world, a massive volcanic eruption results in ash being spewed into the stratosphere of an earthlike planet, blocking out sunlight. The explosion is on a similar scale as the Toba ...
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2 votes
1 answer
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I have scrambled the earth’s landmasses to form the world of Htrea [closed]

There are still mountains in the same spots of their mother continents. Wind directions, orbit, and water temperatures are all exactly that of Earth’s (as well as planet size). The equator runs ...
12 votes
6 answers
3k views

How can I make an earthlike planet windier?

Imagine a planet like earth, but windier. Not pick-up-a-house-and-drop-it-on-a-witch windy; let's say just give-trees-a-hard-time windy. I'd like "high winds" (defined by the United States ...
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2 answers
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What the minimum diameter/circumference a ringworld would have to have cycles of day and night and gravity Earth-like?

I wanted to know what the minimum diameter/circumference a ringworld would have to have cycles of day and night (24 hours complete) and gravity equal to Earth and what the speed of rotation.
4 votes
2 answers
102 views

How do I determine the locations and strength of earthquakes using a fictional tectonic plate arrangement?

I've got a world that I made using a combination of star system and plate tectonics simulations via a variety of programs. I've used this to build plenty of overlays for my world map—plate boundaries, ...
1 vote
3 answers
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I'm not a biologist or an engineer. How do I design legs for a large animal that leaps very long distances?

For designing fictional animals, I'm trying to design one with four appendages that is meant to jump large distances vertically and length-wise and is as large or larger than a human, with hands or ...
2 votes
2 answers
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I’m making this story that has a blown up planet, and I’m trying to have some animals and creatures that live here that have changed or been modified [closed]

So In this story the main planet has been blown up way before the point of the story taking place, and well I have most of the architecture down I’m stuck on coming up with creatures to inhabit it and ...
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3 answers
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Would tall arboreal humanoids make good swimmers?

These are tall, sapient great apes that primarily live in trees, but come down for occasional food or things that catch their interest on the ground. By tall, I mean 6-7 feet on average, but because ...
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4 votes
5 answers
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Could giants fit into a forest?

In my fantasy world, the forests are massive, reaching for miles and miles over the country, full of amazing creatures and just wonderful things. The thing is, I want my world to be relatively young, ...
17 votes
4 answers
2k views

How do I determine when a planet is visible?

Recently, I was working on the various astronomies and astrologies of my fantasy world, when I had an interesting thought: “What if there was a planet that was so faint, people would be arguing if it ...
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5 votes
2 answers
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What preparations are needed for putting a scientific explorer base on another planet?

In my book, a group of scientific explorers want to put a base on the planet so what would I need to make that possible? The planet is a super-Earth but has lower gravity than Earth. The ship they use ...
3 votes
1 answer
138 views

Is my large tropical continent too dry or not dry enough?

I'm looking for a realism check on the climates of a Eurasia-like continent situated mostly in the tropics. I want to maximize tropical rainforests, savannahs, and hot semi-arid climates. Here is my ...
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3 votes
2 answers
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How would iron and alkaline-rich soil affect plant life?

In one of the solar systems I've created for my fictional universe, there is a small planet within the habitable zone between the size of Mercury and Venus. It's an incredibly rocky planet, with high ...
4 votes
2 answers
73 views

Can an Earthlike planet orbiting a K-type star have longer days and extreme thunderstorms?

The planet orbits a K-type star. Basically same gravity as Earth's, with similar atmosphere. I'd like it to have a 30-hour day, plus in my characters' region, occasional very bad thunderstorms. Think ...
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7 votes
1 answer
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Microclimates of Peaks of Eternal Light on a Earth Like Planet

Peaks of Eternal Light are hypothetical mountain peaks that exist on the poles of worlds with little to no axial tilt. My question is simply, if such a peak did exist on an earth-like planet, one with ...
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9 votes
1 answer
821 views

How far away from earth could atomic weapon detonations be detected?

Let us suppose that ten high kiloton to low megaton range fission/fusion weapons are being detonated between three and five kilometers under the surface of the sea on a planet much like earth, in a ...
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26 votes
9 answers
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Why would my sect permanently change the color of my hair and irises?

I live in a pre-industrial world, very similar to earth, but with very limited access to magic (no flight, only healing very minor injuries, making flowers grow faster, lighting a candle, etc.). I ...
5 votes
2 answers
295 views

Are my "ZW humans" plausible?

I'm worldbuilding a human inspired species where females are larger than males. According to the explanations I've read about why that would happen with birds of prey, dimorphism comes from: Avoiding ...
5 votes
1 answer
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How fast would 2ft tall people process alcohol?

I have a world both of normal humans and a fantasy race that are basically 2ft tall, with large heads and torsos and stubby legs if that's important. They typically weigh about the same as a housecat. ...
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1 answer
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What would Inversia's climate map look like?

Inversia is a world conjured up by Chris Wayan that expands on the old "inverted Earth" trope. The instructions he made were as followed in this link: Mark the sea level carefully. Remove ...
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2 votes
0 answers
92 views

What would the climate of a Pangaea-Ultima-inspired world be like?

In a sci-fi scenario, human explorers have discovered a binary of G0 stars, each one 105% as wide, 110% as massive and 126% as bright as our sun. Orbiting this binary within its habitable zone is an ...
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4 votes
1 answer
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Seasonal Weather in a Forest with Polar Night

I'm investigating the feasibility of a world where there are taiga forests located far enough north to experience a significant polar night, say, no civil twilight for at least a few months. Inside ...
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2 answers
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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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3 votes
3 answers
95 views

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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1 vote
2 answers
85 views

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 ...
2 votes
1 answer
114 views

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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1 vote
4 answers
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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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4 votes
1 answer
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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 ...
4 votes
2 answers
210 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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1 vote
4 answers
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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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7 votes
2 answers
192 views

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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5 votes
2 answers
188 views

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 ...
5 votes
3 answers
242 views

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 ...
3 votes
4 answers
183 views

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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1 vote
3 answers
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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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0 votes
1 answer
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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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1 answer
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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?
4 votes
3 answers
147 views

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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3 votes
2 answers
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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 ...
4 votes
2 answers
125 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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5 votes
2 answers
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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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3 votes
1 answer
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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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4 votes
1 answer
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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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2 votes
1 answer
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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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2 votes
0 answers
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What would weather be like on a smaller Earth that has the same surface gravity?

First, this is my current understanding of things, using the Universe Sandbox. To have the same surface gravity as Earth's on another planet that's smaller than Earth, you would have to increase the ...

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