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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5
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2answers
528 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 ...
3
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1answer
110 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
98 views

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
127 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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0answers
52 views

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'...
3
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2answers
112 views

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 ...
7
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2answers
135 views

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 ...
3
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0answers
97 views

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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0answers
57 views

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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0answers
64 views

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. ...
3
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3answers
121 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
152 views

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
87 views

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 ...
2
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1answer
92 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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0answers
22 views

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 ...
2
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1answer
125 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 ...
2
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5answers
499 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
156 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 ...
3
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1answer
139 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 ...
3
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3answers
217 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 ...
3
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1answer
88 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
81 views

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 ...
2
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1answer
117 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 ...
3
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3answers
131 views

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
120 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 ...
3
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0answers
126 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 ...
4
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2answers
137 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
115 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
9k views

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 ...
3
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2answers
109 views

How would a human body behave if the atmosphere pressure were 2Atm at the sea level?

I am wondering if on an otherwise Earth-like planet the atmosphere pressure were constantly 2Atm at the sea level, how would a human body behave if we landed there? Suppose the air composition would ...
6
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2answers
102 views

Reasonable atmosphere for an Earth-like planet orbiting a K dwarf star (including abiotic oxygen)

I would like for my planet to be close to Earth’s size (so similar gravity), with much of the surface covered by water, containing atmospheric oxygen from abiotic processes (the photocatalytic ...
7
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5answers
320 views

How fast would I have to flap my arms in order to fly?

Suppose I am a super-being. From the outside I look and act exactly like an ordinary human. My flexibility of limbs is the same as that of a human so I can't shape-change or bend my arms unnaturally. ...
9
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1answer
325 views

Planet with natural process(es) that results in cube-shaped mountains

Premise The task is to explain how a planet can possess cube-shaped mountain ranges and maintain them across geological time scales. I have tossed around several ideas, such as creating a vacuum ...
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6answers
2k views

Would a lobby-like system of self-governing work?

In this form of self-government, a lobby is a set of 21 people in an area. Similar to a county, but on a much smaller scale, each lobby governs their immediate surroundings. The 21 people are only ...
3
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1answer
100 views

What (if anything) can cause a substantial and stable shift of the magnetic poles of a habitable planet away from its geographical ones?

Most planets have magnetic poles that align pretty well with their geographical ones. On earth, for example, the magnetic dipole field is tilted about 11 degrees from the rotational axis. As far as I ...
2
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1answer
79 views

Can a carbon planet form within a silicate-based planetary system?

Can a carbon-rich planet form in a solar system where all the other planets have a lower carbon-to-oxygen ratio (like Earth has silicates and oxides, or oxygen and silica)? (Let’s say the planet ...
5
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1answer
124 views

Are Aeroplankton a feasible food source?

On an Earth-like planet, you would assume oceanic plankton and terrestrial microorganisms would exist. But, could there be plankton in the sky? While there are certainly nutrients floating through the ...
10
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4answers
322 views

Would seasonal fungal forests be possible?

This question is inspired by a comment by PcMan Imagine you have an Earth-like planet, except it is just a little farther away and has longer days. Instead of having a tropical equator, the planet now ...
5
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5answers
219 views

What would cause creatures on a planet to favor large sizes over small sizes?

On Earth, there are far more insects by biomass than any other creature type. Not only that, but they constitute a wider variety of species too. As a result, they also evolve interesting mechanisms ...
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11answers
2k views

How to best use my hypothetical “Heavenium” for airship propulsion?

The inhabitants of my Earth similar world have a preindustrial society, but have managed to create airships. These use plywood, hot air and relatively thick material for the envelope. But these ...
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2answers
116 views

The Effects of gravity on humans and animals on a world 4x the size of Earth

I am Building a world over 4 (about 4.7) times the diameter of earth. It's made of the same elements as earth. It rotates on an axis same as earth so it has the same seasons as earth. But it rotates ...
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2answers
383 views

can a planet survive after its inner core disappeared suddenly? [duplicate]

i have seen similar questions but not exactly what am looking for. what i want to know is if the planet would stay as a planet rather than tearing it self apart into large separate chunks. i know its ...
3
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3answers
150 views

What would the geography a planet with extreme tides look like?

A planet with two orbiting moons (not-tidally locked) and large oceans will have extreme tides. Both moons are about the size of our Moon. I do not know an exact number, but I'm estimating somewhere ...
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2answers
199 views

What if aliens recieved a rogue Earth?

Imagine: You are a member of an alien species, uncomparable to most living things on Earth, and living on an arid planet, around country sized oases. During your version of the 1800's your star ...
7
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6answers
1k views

Artificial atmosphere bubble around a planet?

Premise I’m trying to design a planet with atmospheric conditions nearly identical to Earth, but with roughly the same size and mass of Titan. Titan lacks the conditions to maintain an atmosphere on ...
4
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2answers
99 views

How could a planet with a long day-night cycle naturally regulate its temperatures to allow life?

So, my planet has (around) an Earth year long day-night cycle. How could its temperatures not reach extremes that would disallow life? Assume that everything is Earth like except for multiple moons (...
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4answers
2k views

How much oxygen is needed in my atmosphere to oxidise copper 38 times faster than normal?

I would like for copper in my Earth-like world to oxidise roughly 38 times faster than copper normally does on Earth. This means that copper will turn green within around 195 days as opposed to the 20 ...

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