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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7
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2answers
79 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 ...
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5answers
249 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
271 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
77 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 ...
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1answer
60 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
85 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
282 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 ...
6
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5answers
180 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
88 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
364 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 ...
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3answers
127 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
183 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 ...
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6answers
965 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 ...
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2answers
81 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 ...
3
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1answer
68 views

How can room sized amethyst geodes form commonly?

I would like my Earth-like planet to have a very strange feature. Near spherical amethyst geodes with diameters up to 11 meters - the size of a large room, form commonly underground at depths from 30 -...
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2answers
133 views

Need a material for a giant pyramid built in the ocean of a prebiotic earthlike planet?

I am working on a worldbuiding project. In it, an advanced alien civilization traveling the galaxy find a habitable planet with conditions similar to Earth before the development of multicellular life....
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5answers
5k views

Is there something wrong with my fictional lighthouse?

I'm writing a story of a fictional location on Earth, or a very Earth-like world, perhaps set in the late 1800s, or at some point when lighthouses were still in use. It's located on the Eastern end of ...
2
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1answer
102 views

What would the currents of an ocean world with no continents look like?

This is an earthlike planet in every respect (same 24 hour day, same orbital year, etc) except it is an ocean world. There are no continents, and the global ocean is significantly deeper (10 miles, or ...
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3answers
144 views

How to minimise the size of temperate zones of an Earth like planet?

I want to create a planet similar to Earth but with narrow temperate bands between much wider tropical and polar bands. How can this be achieved? The planet must be similar to Earth and capable of ...
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5answers
627 views

Could an earth like planet turn into Venus and then back again?

So, I have an Earthlike planet with a healthy biosphere, and I need to completely reset all complex life on it. Near as I can tell, one way to do this is by totally destroying the atmosphere (after ...
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7answers
4k views

Lightning-powered vehicles - are they possible? Are they realistically usable for everyday transport?

Note - I have tagged this as hard-science because, apart from feasibility, I'm hoping for some actual numbers that will tell me the capabilities of such vehicles. Background On a planet far away ...
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3answers
86 views

How to alter geological landforms on Earth

I want to use Earth for my setting, but also want to alter its continents and tectonic plates to look more fantastical than before. If an ancient alien terraforming fleet arrived and was able to ...
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4answers
741 views

Is it possible to have a several hundred mile long sea joining two oceans that's similar in width to the English Channel?

I've got two landmasses that are each situated on either side of a 20-50 mile wide sea (with the width varying along its length) where the sea runs for several hundred miles before opening out into ...
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0answers
60 views

What differences would there be inside a world where the sun/moon are in orbit around the Earth? [closed]

Suppose some crazy-ass god or whatever decides to create its beautiful project: the planet Earth. And of course it is the central key of its universe. The sun, the moon, nearby planets, all of they ...
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25answers
8k views

With what liquid should I fill my dead, intraversable seas?

My planet has interesting geography; there are large islands, each with a unique civilisation of people. But separating them are impassible barriers; they consist of a double range of tall, steep ...
7
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2answers
257 views

A stronger replacement for calcium carbonate in super-strong scales?

So, the microstructure of abalone shells is 95% calcium carbonate, such as aragonite, tiles and 5% organic polymer that binds them together. This binding fails in a graceful manner, allowing the shell ...
4
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1answer
142 views

What climates can I expect on my fictional continent?

I am creating a fictional continent on a fictional Earth-like world that is mostly ocean. The planet is the same size as Earth with the same gravity level, orbiting in an equivalent region of its host ...
3
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1answer
94 views

Distance required for a Red Giant Star to have an apparent magnitude of -13

Assume this Red Giant has the properties of Aldebaran (α Tauri in constellation Taurus) with an absolute visual magnitude of −0.641M. How far would it have to be from Earth in order to possess an ...
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2answers
201 views

Does extreme atmospheric pressure increase or decrease the power of weather?

The world I have imagined is much like Venus, with an atmosphere at "sea level" 70 times that of Earth, and temperatures at the same altitude approaching 377 degrees Celsius - with much more ...
4
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1answer
149 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
67 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 ...
4
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1answer
167 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 ...
2
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3answers
281 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
134 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 ...
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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....
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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
207 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?
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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 ...
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3answers
184 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 ...
41
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11answers
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
153 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 ...
2
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2answers
110 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
158 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
95 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 ...
6
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3answers
604 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
204 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
165 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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