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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4
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1answer
121 views

What would happen to a world with three moons?

The world I’m building is approximately 1/3 of the size of earth and it has 3 moons orbiting it. The orbits are all different but occasionally they have either a full moon or a new moon on the same ...
4
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1answer
61 views

Evolutionary narrative for bipedal troglodytes

It would be easy to assume conventional evolutionary heritage and have humans move into caves later, but in this otherwise earth-like world, the surface was never habitable. Given the somewhat ...
5
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1answer
142 views

Is there any way to estimate the carrying capacity of large fliers?

When it comes to the usefulness of large fliers in modern combat, the most important question is: "How much can they carry before they can't take off anymore?" It would be beneficial if you ...
3
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2answers
184 views

Is it possible for Earth to have evolved quicker than it did in terms of socialness and technology?

As a writer, I've created a world where the year 1786 is equivalent to 2019 but is a little more advanced in a few ways. Scientifically, would it be possible for Earth to have evolved socially and ...
3
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1answer
113 views

What kinds of rock formations might hint at terraformed mountains?

I'm working on a concept for a terraformed world with artificial mountain ranges/plateaus that stretch higher than a natural formation possibly can. I picture them like extremely tall table-top ...
7
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2answers
2k views

Life on Earth without a magnetic field?

Consider an Earth-like planet in a solar system much like ours that doesn’t have any magnetic field (or at least a very weak magnetic field) because of a lack of metals like Nickel beneath the surface....
19
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2answers
3k views

Could tree-sized mushrooms grow on an Earth-like world?

OK so this world I'm building has Earth-like flora and fauna, along with being around the size of Earth and being around the same distance as Earth from a star the size of the sun. The atmosphere is ...
5
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2answers
190 views

Would very small humanoids be able to use rats as mounts?

These humanoids would be about 13cm tall. Is there anything preventing them from mounting rats with proper training and a customized saddle?
7
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15answers
1k views

How to shape society's values such that paleontology becomes the largest / most profitable industry?

In our iteration of "Earth," there are several studies suggesting that the study of paleontology is itself going extinct. In an attempt to envision a brighter future for the field, I want to build a ...
8
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3answers
149 views

Biome favoring extreme sexual dimorphism

Sexual dimorphism, that is the difference is size between the male and a female of the same specie, is common yet normally not extreme. There are however species where the difference is extreme: I ...
39
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10answers
8k views

Clothes in a vegetarian society?

Two of the societies in my world are supposed to be vegetarian/vegan. Society 1 lives in a temperate climate, similar to central/eastern Europe. I've thought of cotton-like plants for clothing and ...
5
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3answers
120 views

What is the best procedure or program for creating a 'realistic' worldmap to suit my setting?

I have a fairly-straightforward alternate modern-day Earth setting, somewhat similar to Ace Combat's Strangereal or the 'America' seen in Rockstar North's GTA series (real life, with the serial ...
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2answers
101 views

Earth-like planet : the development of first civilisations

After building tectonic plates and today's continents shape of this earth-like planet, comes the time to put humans on it. On this planet, humans have expanded and traveled the same way Homo erectus ...
4
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1answer
149 views

How far above the galactic plane could an Earth-like planet develop?

I was zooming around on Space Engine and came across the moon of a gas giant that was hovering well above the galactic plane. I'm admittedly not well-versed in under what conditions an Earth-like ...
4
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1answer
89 views

How large and compact could a cold east Mongolia-like steppe be on an Earth-sized planet?

Welcome to planet X! Planet X is the same as Earth in radius, composition, axial tilt and orbits star Y (identical to the Sun). Planet X has a moon known as moon Z (identical to Earth's moon). Could ...
5
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3answers
579 views

Is it possible for a moon to stay on the same side of its planet relative to the sun?

I'm building an earthlike world that has a moon orbiting a gas giant. Is it possible for the moon to always be between the planet and the sun? Also, is it possible for a moon to rotate around its own ...
9
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2answers
187 views

How long can a wooden door last?

The setting I've cooked up for a D&D campaign I'm running features a fair amount of buildings that have been totally abandoned by civilization for hundreds or even a thousand years. Obviously ...
2
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1answer
150 views

If Earth had a smaller second moon, what would the sky look like?

I am creating a fantasy world in which Earth has a second moon with an orbit between Earth and the current moon. The orbit of this new moon is faster because it's closer to earth. I'm not much ...
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1answer
72 views

What would it take for earth to have a perpetual layer of clouds, making impossible to see the surface from space? [duplicate]

And what would the consequences of this massive be? I assume heat would drop to an extent at the least, right? And less UV light for plants?
5
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2answers
113 views

Could a hypothetically big enough planet, with an earth-like atmosphere, be big enough so that you cannot see its curvature from above?

I want to know if a planet with an atmosphere identical to that of Earth could be big enough so that from no point in the lower atmosphere it would be possible to appreciate the curvature in relation ...
8
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3answers
207 views

How quickly could a rogue Earth return to habitability after a deep freeze?

Background A large star makes a relatively close approach to a solar system like our own and the orbits of many of the planets are badly perturbed. A planet similar to Earth is in the wrong place at ...
4
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2answers
132 views

How to construct an Earth-like world with very high wind speeds

I want to create a world where humans can live outside (perhaps with some protective clothing) but where very high winds exist in almost all potentially habitable areas making life outside impossible ...
2
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1answer
149 views

One half of my population was eliminated. How do I restore them without causing havoc? [closed]

A few years back, the Evil Overlord magicked away half of the world population - they were effectively locked away in time, for all intents and purposes. Then, against all odds, the Super Team was ...
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3answers
320 views

What would the geologic record look like on a planet in the galactic halo?

Imagine an Earth-like planet orbiting a Sun-like star in the inner halo of the Milky Way. As a halo star, it will likely be somewhat metal-poor, having formed early in the life of the galaxy, but ...
4
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6answers
324 views

can human sized humans feasibly live on an immortal dead human the size of Earth?

it sounds like it's an impossible thing, but what i mean is that the immortal is dead, but its body isn't decomposing. it has about the same atmosphere as earth as well. it could be curled up into a ...
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8answers
9k views

If people were the size of cats, and the land was scaled down accordingly, what would the size of England be?

So imagine people were the size of house cats, and the world's land masses were scaled down accordingly (in volume). In comparison to the original size of the landmass, how big would England be? And ...
5
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1answer
118 views

How to have hollows with complex plant and animal life on a planet

This is a slight continuation of my other post where I was trying to create realistic hollows with weather due to temperature changes due to bio minerals called Hearthstones. I was wondering if plant ...
25
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19answers
7k views

Would common people in central Europe in the 15th century notice that the whole Asia disappeared?

We have earth at the beginning of the 15th century, and suddenly the biggest continent disappears. There is nothing left of it, no animals, people, lands, anything. I don't think the details of the ...
4
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2answers
124 views

How does composition change if you extend an Earthlike atmosphere 50km below sea level?

I'm working to design the atmosphere of a fictional planet inspired by Venus (let's call it Cael). Cael's atmosphere at an altitude of 50 km is essentially identical to Earth's atmosphere at sea ...
2
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3answers
192 views

Near-future weapons taking designs similar to 17th century weapons

I am doing an alternate-history of Earth going into the science-fiction area. The split came with a portal to a new planet appearing around the 17th century. The portal deposited those brave enough to ...
4
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2answers
222 views

Penguins in the Not-Arctic, how would this affect the poor seals

In a not so different fantasy world, whose physics and thus are similar to our own how would including penguins affect the look and function of a typical arctic ecosystem. For the purposes of this ...
2
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4answers
132 views

Mid industrial revolution society on the planet from Pitch Black? [closed]

What would life be like for people in an 1800s era setting (give or take a century or specific technologies that should or should not exist if it's convenient), who live on a planet inhabited by the ...
3
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1answer
115 views

How abundant could silver be in one place if given the right circumstances?

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, as ...
8
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2answers
181 views

Would this dragon-rider combo be physically plausible?

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 ...
3
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1answer
148 views

Position and Size of my Continents/Islands

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 ...
2
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1answer
118 views

What would our world be like without zinc? [closed]

Suppose that we evolved on a planet entirely without zinc. How would our civilization be different if we didn't have access to this metal? What alternatives would we develop? What technologies would ...
8
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4answers
365 views

If humans were transplanted to a different Earth-like world that they didn't evolve on, how would they deduce how they came about?

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 other ...
2
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2answers
69 views

How do the Martians prevent salinization of their canal network

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 habitable ...
3
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1answer
77 views

Ideal sun type and corresponding effects for a terrestrial planet with 256 days in a year?

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 the ...
7
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4answers
190 views

How far should second star be in my binary system?

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 ...
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3answers
223 views

How can my 1.2 km long aircraft carrier catch ships like “Queen Anne's Revenge”? [closed]

Rod Reiss is the name of my fictional aircraft carrier. It's a 1.2 km long, 180 meters wide and 90 meters high slab of metalic foam of an alloy of aluminum, designed to withstand high temperatures. It'...
3
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1answer
223 views

What to remove to make a realistic Omni-Directional Maneuver (ODM) gear?

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 at ...
6
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2answers
162 views

Life without a bright star?

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 necessary ...
3
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4answers
494 views

Are two Pangeas possible?

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 ...
8
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3answers
320 views

Planetizing the World of Jack and the Beanstalk: How Small is Too Small?

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, ...
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4answers
130 views

What could hinder a highly developed species from erasing humanity from the surface of earth? [closed]

Sorry for my poor English. Me and google translator are doing our best to translate my question properly. My story evolve around sentient planets. Let’s imagine every Planet in my universe is ...
1
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1answer
95 views

Living on a moon with an atmosphere, how would the planet interact with the sun in the sky?

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 ...
2
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3answers
110 views

Could a planet have a week long day and a week long night depending on the season?

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 week ...
4
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3answers
170 views

is there a way to levitating entire body of water in earth and make it stay in the sky?

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 ...
1
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1answer
156 views

What Star would encourage what color of plants? or, a table of star types to the most efficient plant color [duplicate]

Using the following list of stars, what color is the most efficient for plants to absorb the ideal amount of energy? (This is not a complete list of star types, just some big examples) Yellow Dwarf ...

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