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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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Causes of extreme seasons on an Earth-like planet such that humans need to migrate

I am thinking of an Earth-like planet that has extreme seasons (temperature) such that the humans (or other lifeforms) living there need to systematically migrate (probably twice per year) from one ...
Blair Nangle's user avatar
5 votes
1 answer
499 views

Where should my currents go?

I'm trying to figure out how to place currents in the green area. There doesn't seem to be anywhere for them to come from, and I seem to have backed myself into a corner with the geography of this ...
www's user avatar
  • 1,299
3 votes
0 answers
80 views

Roughly how big could the tidal range be on a human habitable Earth analogue world?

The Gravitational tidal forces can be supplied by any orbiting moon(s)/twin planet(s) of any mass and any orbital radius, inclination or orbital radius, but the system must be stable for at least 10,...
Slarty's user avatar
  • 37.6k
3 votes
5 answers
195 views

Would things engineered to work on earth work ok in 1.25 times earth gravity? [closed]

A while ago I asked this question about if a planet 1/5th larger than earth could remain earth like. The top answers all seemed to agree that while the planet could be that much larger and still only ...
OT-64 SKOT's user avatar
  • 4,496
2 votes
2 answers
165 views

What's the effect of increasing the Earth's rotation on climate?

The Earth's rotation speeds up slowly but without limit. How does this affect the climate? I am thinking that day and night temperatures would even out so that there would be less wind, but I don't ...
spraff's user avatar
  • 2,239
2 votes
2 answers
201 views

A calendar/timekeeping system based only on the stars?

I'm playing with an otherwise earthlike world where I have handwaved away the visible sun and moon: anytime you look at a cloudless sky, you see stars, and only stars. How can the people of this world ...
RLoopy's user avatar
  • 1,000
4 votes
6 answers
276 views

How quickly can a continent split and separate without an Extinction Level Event occuring

Consider an Earth-like planet. I want a large (Europe/Africa) continent to split in half, with the halves separating in a reasonably short time (by geological standards). The halves need to separate ...
spraff's user avatar
  • 2,239
2 votes
1 answer
182 views

Is my climate map plausible?

I've created an Earthlike planet and spent a lot of time trying to get the climate right. I have included a map of elevation and currents. Are these climates possible, given their surrounding factors? ...
www's user avatar
  • 1,299
4 votes
1 answer
165 views

Weather and climate of an Earth-like planet orbiting an orange dwarf

I am creating a solar system with fictional planets as a setting for my space novel. Luckily I have some nice tools for creating quite accurate astronomical data. The planet where my protagonists live ...
Alessandro Miletti's user avatar
1 vote
1 answer
90 views

Am I placing high and low pressure zones correctly?

I'm using Geoff's Climate Cookbook to try and make the climate of my world, but I'm really struggling and I don't understand much. I've put the high and low pressure zones down on my map, but I feel ...
eggsalad's user avatar
-3 votes
1 answer
164 views

How would a supernatural boiling sea in the Southern Ocean affect Earth's climate? [closed]

How would a boiling sea in the southern ocean near Antarctica affect Earth's climate? This boiling sea was caused by supernatural forces providing the energy to boil the water while also keeping it ...
TheGoldenBoy2188 The Coolest G's user avatar
18 votes
6 answers
6k views

How long would it take humans to notice a civilization on Venus?

Now I know this is a very weird and impossible question, there is clearly no civilization on Venus. But for the sake of the story I'm cooking up in my head, Venus remains habitable and develops life ...
Dono's user avatar
  • 181
2 votes
2 answers
292 views

How would sensible waste disposal be accomplished for terrestrial creatures in a primitive society? [closed]

Necessary context: Various real animals like birds, foxes and snakes plus fictitious ones like qilins/kirins, gryphons and gloomstalkers (raven-like birds with some minor serpent features) possessing ...
KeturiosBlue's user avatar
4 votes
1 answer
132 views

What is the lowest reasonable density for a Super Earth with earthlike living conditions?

A large planet roughly 3-4 times the mass of Earth. Trying to keep Gravity between 0.75G-1.25G for Earth-like Conditions. I've looked into certain materials such as Silicon Carbide, which is ...
Spoon's user avatar
  • 153
1 vote
2 answers
212 views

Could humans live on a cylindrical celestial body?

Let's imagine a roughly (or perfectly?) cylindrical celestial body. Other than it's shape, everything about it astronomically (distance from sun, orbit shape, etc.) is the same as Earth. Is it ...
Mocascoolai's user avatar
0 votes
0 answers
42 views

Can nature adapt to life without constant access to sunlight? [duplicate]

I create a world where the sun's rays no longer reach the planet, due to the clouds completely covering the sky. Nature must therefore adapt to life without constant access to photosynthesis. I haven'...
batatich's user avatar
2 votes
2 answers
175 views

If Earth were located at 1.1 AU from the Sun, would this affect the two zenithal passage days in the Tropics?

I am designing calendrics for an Earth-like planet located 1.1 AU from a Sun-like star. On Earth, on April 30th and August 13th, the Sun appears to pass directly overhead between the Tropics of Cancer ...
JM Yaden's user avatar
  • 305
2 votes
1 answer
87 views

Feasibility of a moon-planet orbiting an F star [closed]

I'm building an earth-type planet with typically human-like people, but a few differences. The human's particular area won't have much in the way of seasons being a large equatorial island. I'm ...
RedFrog's user avatar
  • 21
6 votes
3 answers
291 views

What technologies would be useful to a society trying to attain elevation?

Setting This question is about a human culture, with conditions essentially the same as Earth's with technology roughly comparable to early middle ages. The climate is roughly Alpine, although the ...
Jamie Lear's user avatar
2 votes
2 answers
158 views

In the rainshadow of an equatorial mountain, would savanna (Aw) or hot desert (Bwh) replace rainforest?

This is a map of the area in question (pink/brown = mountains, lime = savanna, and dark green = rainforest). The top line is the equator, and lines are 10° apart. Would the area in the upper area of ...
nearsighted's user avatar
2 votes
0 answers
46 views

How could I make an earth sized planet with 3 moons work? [duplicate]

Im world building an earth sized planet with 3 moons. These three moons are symbolic in my world with many religions on this world celebrating the number 3 and saying the best things come in 3. I was ...
Tonythundergod's user avatar
5 votes
2 answers
656 views

Do the mountains formed by a divergent boundary form on either coast of the resulting channel, or on the part that has not yet separated?

The lakes and the bay are formed by the rift where the right chunk is diverging away from the main plate. I've put mountains on the land part of the rift a la Ethiopia's Great Rift Valley, but should ...
SkyDivingTortoise's user avatar
7 votes
2 answers
160 views

Environmental triggers for evolving broader visible spectrum

Taking some inspiration from the finding that a small proportion is able to perceive significantly more colors than the rest of the population, I would like to explore to what degree similar traits ...
Arash Howaida's user avatar
2 votes
1 answer
426 views

How could an Earthlike planet have two moons, one similar to the Earth's moon and the other primarily composed of carbon? [closed]

I am building an Earthlike planet that possesses two moons, one similar to the Earth's in terms of chemical composition and one primarily composed of carbon. How could these two moons form? Which moon ...
Galactic's user avatar
  • 4,454
2 votes
1 answer
68 views

What stellar temperature, orbital distance, and eccentricity is needed to create an Earthlike orbital planet with a last glacial maximum climate?

I am creating an Earthlike planet with a year length of 515 Earth days and 9 Earth hours. I am aware that Kepler's third law of planetary motion states that warmer stars are needed for longer orbital ...
Galactic's user avatar
  • 4,454
3 votes
2 answers
192 views

How can I hide a flying city? [closed]

In my writings I've created an island I need to hide. The island itself is around 100-200 square miles in area and the island rests around 12,000 feet in the air and is surrounded by a mountain range ...
Pyroking's user avatar
1 vote
3 answers
283 views

How early can some kind of nuclear reactor resonably be invented or stumbled upon?

The physics of this world work practically the same as our own. All these nuclear reactors need to do is make a somewhat usable amount of heat for power generation, possibly ship use. They have to be ...
OT-64 SKOT's user avatar
  • 4,496
8 votes
5 answers
4k views

Would My Planet’s Blue Sun Kill Earth-Life?

I’m creating an Earth-like world where the sun appears blue to people from the planet’s surface. I think I’ve narrowed down the cause of this effect to the presence of 1 micron particles in the ...
Kal Madda's user avatar
  • 1,851
4 votes
2 answers
377 views

Is there a general rule/formula for the length of an ice age?

Right now in our worldbuilding project, my friends and I are working on the history of the world with respect to evolution and tectonics. Recently (322 mya) I was pretty sure an ice age would be ...
nearsighted's user avatar
5 votes
5 answers
266 views

Would this atmosphere be habitable to humans?

I have been creating a world, but I'm not sure if the atmosphere would be breathable for humans. (I'm kind of worried about the xenon levels) The planet is made of 62% Nitrogen (N) 21% Oxygen (O2) 15....
Neil Iyer's user avatar
  • 1,522
5 votes
9 answers
2k views

Long distance travel by non-motorised rolling vehicles

Background I have lush fertile mountains separated by miles of flat, barren desert. Each mountain is home to a community. The distances between mountains vary from 2 - 20 miles. Every occupied ...
chasly - supports Monica's user avatar
1 vote
0 answers
91 views

Can someone tell me what a world with a radius 1.2 times that of earth’s would be like? [closed]

I want to make a world larger than earth for a story I want to write. Please can someone tell me about the different characteristics a world with a 20% larger radius would have: How much gravity it ...
Rohan's user avatar
  • 21
10 votes
6 answers
3k views

How to safely contain dinosaurs in the early 1900s?

A nation has found a large island containing dinosaurs! Primarily those of the late Cretaceous. A nation willing to pour pretty much any amount of money into the project needs a way to safely contain ...
OT-64 SKOT's user avatar
  • 4,496
5 votes
1 answer
699 views

How long would it take to recreate the biosphere on a “dead Earth” planet?

So, one of my main settings involves humanity colonizing an Earth-like planet. The planet has all the abiotic features needed to support mankind (oxygen-nitrogen atmosphere, magnetic field, 70% ...
Jordy the Cat's user avatar
1 vote
1 answer
93 views

On an Earth-like planet, what geologic features would contain which important minerals (such as gold, iron, copper)? [closed]

I'm writing a book that's set on a planet very similar to earth, meaning it has all the same gravity, mineral compositions, and geologic features. With that in mind: What geological features are the ...
Curious Cuttlefish 's user avatar
3 votes
2 answers
202 views

In a world where gravity pass from 1 G to 5 G in a cycle of 365 days, can planes fly all the time?

I am writing a book and I have this cenario. There is a planet where gravity pass from 1 G to 5 G in a cycle of 365 days. I know that humans can survive till 3-5G, but what about airplanes capability ...
Alessar's user avatar
  • 521
6 votes
3 answers
380 views

What sort of evolutionary possibilities are plausible for a human-like species orbiting a red dwarf star?

I'm working on a story which is sci-fi so soft you could spread it on a cracker, but I'd like something semi plausible. I'm very likely overthinking things to an extreme, but I'd like someone with ...
Callisto's user avatar
  • 515
7 votes
2 answers
522 views

Should my superhabitable planet have ice caps?

I'm designing an Earth-like planet and I'm concerned about whether or not it would have ice caps. Originally, I assumed it would be too warm, with a climate similar to Earth's during the Paleocene-...
Thoth's user avatar
  • 317
5 votes
2 answers
294 views

How eccentric can a planet’s orbit be before it is uninhabitable?

So, I am writing a list of criteria for wannabe terraformers so that they know at what point any of their pet projects can be considered truly habitable. This list covers everything from the necessary ...
user98816's user avatar
  • 8,605
3 votes
1 answer
323 views

What metal or mineral commonly found on Earth could be extremely rare on a different Earth-like planet?

I am writing a story where a secret organization in the present day controls a portal between Earth and a different Earth-like planet. The organization secretly ships resources between planets to make ...
Galactic's user avatar
  • 4,454
3 votes
2 answers
250 views

Seasons increasing and decreasing in length in a predictable cycle?

Could an Earth-like planet have a cycle of seasons changing length without changing the length of the year? Having long summers and short winters at the start of the cycle and shifting towards long ...
SeasonalProcession's user avatar
14 votes
13 answers
4k views

Under what conditions would a society be able to remain undetected in our current world?

So hypothetically, what would be the best "hiding" locations for societies/organizations that seek to avoid contact with the rest of humanity? In other words, where would be the best place (...
dreamforge's user avatar
  • 1,302
1 vote
1 answer
60 views

What planetary orbit and geology would speed up an ice age?

I have a first-contact scenario where I would like an ice age to be occurring rapidly. All the things that could change to make a fast ice age more credible: orbital period (403.42 local days), length ...
dsanford0's user avatar
4 votes
1 answer
209 views

Which map-making software is best suited for my interests?

I'm interested in creating a map for a world I've been creating. I've done some research to determine which software would suit me best, and it came down to Inkarnate, Campaign Cartographer, and ...
zucculent's user avatar
  • 143
10 votes
8 answers
1k views

Retrofitting geocentrism - what replaces the star?

The goal is to devise a plausible geocentric system in appearance. However, for simplicity, we will need only to examine the one planet case. And more crucially, this one Earth-like body is to be the ...
Arash Howaida's user avatar
6 votes
6 answers
937 views

What would people living on rocky terrain with access to a river use as building materials?

I'm looking for architectural inspiration for a city I'm designing, and I wonder what kind of building material would be used by the inhabitants. They live at the foot of a mountain, relatively close ...
JasperMW's user avatar
  • 163
3 votes
6 answers
1k views

How would an alien race destroy all nuclear weapons on earth? [closed]

An alien race has decided that earth is the best place to recruit new soldiers and prepare for a war, and they want to eliminate all nuclear weapons (explosive ones, not dirty bombs) to prevent ...
Nepene Nep's user avatar
  • 39.3k
2 votes
0 answers
125 views

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 ...
JohnWDailey's user avatar
  • 14.5k
12 votes
2 answers
3k views

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 ...
Blue Skin and Glowing Red Eyes's user avatar
9 votes
3 answers
1k views

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 ...
KerrAvon2055's user avatar
  • 27.8k

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