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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.

1
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2answers
99 views

Ecological balance in a pleistocene+ world

So a friend is working on a worldbuilding/rpg project and I'm "beta-testing". He drew up an earth-like map and set the players start locations. Then I ask him about fauna. Will it be modern earth? ...
6
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2answers
137 views

If Earth's Oceans Were as Deep as Europa's

Earth's deepest point, the Challenger Deep, is almost seven miles below sea level. By contrast, Europa is smaller than even Earth's moon, yet its oceans are anywhere between 40-100 miles deep! So the ...
6
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1answer
177 views

How could a foam habitat support animal life?

Knowing foam is formed by trapping pockets of gas in a liquid or solid, what could a foam able to support life on an earth-like planet be made of? This foam ought to be stable enough and large enough ...
6
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7answers
854 views

A planet of ice and fire

I had an idea for a planet which has very hot days, roughly 40 degrees C on average, and very cold nights, average -5 degrees. These figures are subject to change. Of course, there are places which ...
2
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6answers
189 views

Life on land, sea, and what else? [closed]

On earth there are two main media that support complex animal life. One is the sea, with creatures living both on the seabed and the water; Another is the land, with animals that live both on it and ...
4
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1answer
206 views

Terraforming the Nine Earths, Episode I: Could Cyanobacteria Thrive in Muspellheim?

Long ago, I asked a question on how to make the Nine Realms of Norse mythology--Niflheim, Muspelheim, Asgard, Midgard, Jotunheim, Vanaheim, Alfhiem, Svartalfheim and Helheim--a reality in regards to ...
6
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1answer
200 views

What would be the effects on a planet orbiting a shedding red giant?

In a sci-fi RPG I eventually intend to run for a couple of friends, I had the idea of them visiting ancient ruins on a planet orbiting a shedding red giant. Now, ignoring the problem of intelligent ...
33
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8answers
6k views

Of strange atmospheres - the survivable but unbreathable

Most gases that are toxic to breathe also do nasty things to the skin when they're in the atmosphere at dangerous concentrations - and one is walking around without sealed protective clothing; sulfur ...
7
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2answers
325 views

How do I give my planet a stronger magnetic field? Playing with variables

Let's say I have a terrestrial planet superficially like earth, except that it rotates much slower (about 10-15 days per rotation) and its atmosphere is ideally several times thicker. If I want this ...
1
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1answer
158 views

What is the largest I can make my water planet, while remaining within Earth-like parameters?

What is the largest planet I can get, while still remaining within Earth-like parameters? My concern is with gravity, water pressure and atmospheric pressure. Escape velocity is less of a concern. ...
4
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2answers
189 views

Snow on a low-gravity, high-pressure world

Disclaimer: I am not a meteorologist. Snow forms when supercooled water droplets nucleate onto particles in the atmosphere. After forming, they grow further by both tumbling around within the cloud ...
6
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1answer
303 views

Could lakes of mercury exist on an Earth-like planet?

I am working on a planet that has insignificant (almost 0 degrees) tilt, no moon, rotates twice as fast as Earth. I intend to create quite an exotic "biome", so to speak, in a subtropical desert zone ...
28
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8answers
7k views

Would glacier 'trees' be plausible?

The setting is in a region of a planet comparable to Earth's California in regards to location. The soil is extremely rich in nutrients and subsurface water. But for the past three million years the ...
8
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1answer
242 views

What is the maximum size of a tribe living off of one whale per year?

A small village of ice miners has popped up in the Northern Territory. They are a mix of southern workers who integrated with the native tribes. The group subsists on the meat of a single humpback ...
10
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6answers
1k views

How would 10 generations of living underground change the human body?

In my country, we are split down the center by an intensely large mountain range. Us desert people live on the eastern half of the country, while on the other side of the mountain range the forest ...
6
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1answer
1k views

Can rocky hills similar to the Scottish highlands be located next to a bog?

I've written about these rocky hills with short grass, gravel, shrubs, and big boulders. At the bottom of one of the hills is a big bog. Basically I've designed some buildings to be sticking out of ...
1
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0answers
92 views

How would an “minecraft-like” dimension behave? [closed]

The "dimension" I'm building, consists of earth-like plane that stretches on to infinity. It's a soft sci-fi universe and this dimension is man-made. The land has infinite mass, I don't know what ...
5
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3answers
195 views

What is the optimal sleep scheduling strategies for a 24h sleep cycle on a 48h day planet?

I have a planet with days that is exactly two times longer than in real world. I'm trying to find out the best time to sleep if people still need as much sleep as they do even if they are on a planet ...
2
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2answers
149 views

Designing a super-comfortable Earth analog

Being an engineer and someone who hates hot summers and frigid winters, and someone who really likes the Rocky Mountain view, I can not help but wonder if we humans could get to design a whole new ...
4
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2answers
113 views

Is it safe to have an earth-like temperature for a 48-hour day-night cycle on a big planet?

I want this planet to be very earth-like on all aspects except for its size and the day-night cycle. The circumference is three times greater than the earth's circumference. The day-night cycle lasts ...
10
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2answers
1k views

Existence of a celestial body big enough for early civilization to be thought of as a second moon

Is there a possible scenario in which once a year a celestial body can be seen from the surface of the Earth-like planet for a short period of time? With it being big enough for early civilization to ...
8
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1answer
132 views

Can you critique my sea temp map and answer a couple of specific questions?

I'm working on yet another iteration of a world map project. I'd like to ask for some opinions on the sea temperature map I've done: I also have a few specific questions about some areas on the map. ...
13
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3answers
426 views

Are these climate zones somewhat realistic?

I have been slowly losing my mind trying to build a somewhat realistic climate map for a fantasy world I'm building for my book. A geographer I am not... I modeled the climate zones and such after ...
2
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3answers
238 views

What kind of extinction event could solve Global Warming?

The world I'm creating will be referred to as E. Current E population is growing exponentially, and the population will become completely unsustainable soon. Global Warming is also increasing ...
16
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7answers
624 views

Will food logistics limit the population of a civilization of obligate carnivores with modern technology?

I'm imagining a world populated with a species of intelligent, social, and "modern" (in terms of technology) humanoids. For the purposes of this question, they and their world can be near identical ...
7
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5answers
166 views

How should a ship call for help on a sparsely populated planet orbiting a flare star?

Technological level - similar to contemporary. Yes, I mean a watercraft, mostly big cargo carrying ships. I mean only calling for help while being in middle of ocean and not being within line of sight ...
4
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5answers
216 views

The effects of magnetism in radio transmissions

Lets say the Earth's magnetic field was stronger without specifying how much stronger. How would have this affected the development of radio transmissions? Would a much stronger field completely ...
3
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6answers
228 views

Areas with high energy on an Earthlike world

In an earth-like world, what can I provide as examples of areas where high energy is generated naturally? I'm looking for sources of energy other than heat, for e.g, volcanoes and geothermic vents.
4
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4answers
327 views

Is is plausible for an Earth-like planet to have all of its land located in one polar hemisphere?

I made a map for my fictional world and it would be convenient for the story to have all of it affected by a somewhat similar climate. The map is made of several pieces of a Pangaea-like continent ...
5
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3answers
607 views

Would plants on a planet orbiting a star like ours, have any different color?

So I'm currently designing an alien habitable planet that orbits a star similar to our Sun. Assuming that the composition of the planet's atmosphere, as well as its pressure, are similar to the ones ...
4
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4answers
171 views

How long could humans survive on my planet?

I have created a planet which is a clone of Earth. Except I messed up where wasps, cobras and scorpions were concerned and they have turned out to be the size of elephants (everything in proportion). ...
9
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2answers
122 views

How to design an electrical grid for a flare star planet?

The most popular type of stars are red dwarves, which regrettably tend to be flare stars. Yes, I know that geomagnetic storms and power lines do not like each other. Technology level: More or less ...
1
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3answers
155 views

How can a kid be so much better than trained adults at “Monster fighting” [closed]

The world is populated not with animals but with "monsters". "Monsters" appear randomly in particular places, and can be caught using specialized devices shaped like a ball. There are many different ...
6
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1answer
203 views

Possible sky colors compatible with life on earth

This question has been asked in similar forms on this site already with some good answers like here: What Color Can the Sky Be? How could the sky be orange in a breathable atmosphere? What would ...
5
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1answer
128 views

Determining factor(s) for making creatures robust to square cubed law

Premise and research I am simply trying to find a reproducible framework for use with creature-design. In my research I have found the larger an animal is, the more likely that animal is to break its ...
3
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3answers
283 views

Can trees and plant life grow on rock?

So I’m creating a world where the ground is mainly made of different rocks and stone in most areas - soil is sparse. Could trees and plant life grow on the stone ground if a water source is nearby? ...
13
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4answers
3k views

How tall can you build a mountain chain of bricks?

My ancient golden dragon has a lot of time, since he doesn't die of old age in my world, and a lot of magical constructs that will tirelessly built a defensive mountain chain for him. This chain will ...
7
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10answers
3k views

What mechanisms need to be in place for an advanced, peaceful society to retain high testosterone levels?

While by no means a smoking gun, there is still a reasonable amount of empirical evidence on the notion that socialization and testosterone are negatively correlated. Archaeological Evidence From ...
-2
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2answers
152 views

How to keep a country rigorous when not at war? [closed]

I'm trying to create a world that has a strong military and good citizenship even in times of peace. I'm kind of stuck at the moment, but I have done some research already, so here is a brief case ...
30
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7answers
5k views

How can I make raindrops bigger?

I've got an intelligent humanoid species living on a planet very similar to Earth's. However, on this planet, rainstorms are more frequent and slightly... different. Each raindrop is at least an inch ...
29
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8answers
5k views

How would trees communicate?

An alternate world is populated by mainly intelligent trees and other plants. These plants are almost exactly the same, biologically, as Earth's plants. The world's climate and geology are very ...
7
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5answers
677 views

What kind of “space force” would be needed to protect space assets in the near future?

Premise Even at present day, space assets are very valuable: Our space assets, day by day, are growing by leaps and bounds. It's the value of that satellite to the economy. - Neil deGrasse ...
7
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5answers
338 views

Barring all structural and stability issues, how would building a ringworld around the earth affect it?

I've looked for an answer for this, but the only information I could find dealt with the ring itself. All I want to know is what would change on the Earth if all problems were solved and the ring were ...
4
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6answers
248 views

Imposing scientifically derived requirements for holding public office

Earth Here on Earth, who serves in public office depends a handful of factors -- some of which are unsettling. In the US there is the infamous Wall Street-Washington Corridor where financial ...
5
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1answer
214 views

How to make a bigger planet be as similar to Earth as possible

My fantasy world is slightly larger than earth so that discovery of the continents becomes harder (about 20% surface should do it). But at the same time I want to preserve most aspects to make it like ...
9
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1answer
412 views

Can someone help me with ocean currents? I'm really confused

I've been working on a constructed world which started out as the home of an alien race from a sci-fi story I'm writing but just became a pure world building project. As you can see from the map it ...
8
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7answers
1k views

Extreme adaptation: evolutionary narrative for Vantablack-like skin pigment

Premise Inhabiting my earth-like world will be humanoid beings that have a skin tone that is as dark as Vantablack. Let's assume these human-like beings share the same ancestry as humans and we can ...
1
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1answer
203 views

Near spherical alien species - How can they move?

The setting On an Earth-like planet but with completely different flora and fauna there is the Great Plain. It is similar in size to the Serengeti National Park on Earth. The Plain is surrounded by ...
13
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8answers
2k views

Towers to Low Earth Orbit - How to make them usable for navigation

In a world I'm constructing the sun, the moon, and the stars are not visible but there are tower that stretch from the ground to, roughly, low earth orbit. Each one is around 200 meters in diameter ...
2
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9answers
654 views

What Could Cause A Kingdom To Keep Slavery Despite the Royal Family Refusing To?

Slavery in my story's world is common. Most don't see it as a good thing and slave-owners are rarely liked, but slaves are common enough nonetheless. The royal family had personally stopped using ...