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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20
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15answers
3k views

In what sequence should an advanced civilization teach technology to medieval society to maximize rate of adoption?

If a small group of an advanced civilization got stranded in a medieval-like society on another planet and they start to interact in a peaceful way, what would be the first technologies that they ...
4
votes
2answers
164 views

How would mountainous landscape look like after remodelling it with nuclear warheads?

As conclusion of this question it seems that under a dense atmosphere it would be a good idea to place the main city in mountains. Just there is the inconvenient issue that top of mountains lack flat ...
8
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1answer
176 views

What is the fastest an earth-like planet can spin and still support life, and would it be possible to launch space-craft from it?

I was wondering, if a planet in similar size and mass to earth would have, from its creation, been spinning at this hypothetical planet speed limit (with it somehow staying in once piece) could life ...
7
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3answers
161 views

How many human inhabitants could Earth host in a far future? [closed]

Assuming a technologically advanced civilization that has grown sustainably from the resources of its own planet (and maybe "a few" additional resources from its own solar system), what would be the ...
7
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3answers
124 views

Can my planet have a very thin atmosphere only at the poles?

While thinking about Starfish Prime's answer to the question Algae using UV light from auroras for photosynthesis, I considered the possibility of an alternate Earth which has a normal, Earth-like ...
6
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7answers
254 views

Always night in one hemisphere. Is it viable?

I am building a world where one side of the planet has normal progression of day and night whereas in the other hemisphere it is always night. At first I had no idea how this could be possible in the ...
3
votes
1answer
110 views

Will my planet work? (size, gravity, atmosphere)

I was going to sort this all out beforehand, and then write the book, but when the writing flows... you make hay. I am a perfectionist/details-oriented person, but you lose me on math/hard science. ...
4
votes
1answer
66 views

distance between climate/geographical changes

I have an Earth-like world (approximately 1000CE technology--horse/mule for travel) that I want to have my characters traverse over the course of the book. I want the areas to have distinct geography/...
3
votes
2answers
168 views

Possibile explanation for a [somewhat] realistic floating continent scenario?

I'm writing a story that takes place in a world where people live on continent-sized chunks of earth (basically the size of tectonic plates) suspended in the air, left over from some cataclysmic event....
3
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3answers
174 views

Which Stars Would Best Suit For the Habitable Zone of The Nine Norse Earths?

In an alternate universe, the nine realms of Norse mythology--Midgard, Asgard, Vanaheimr, Jotunheimr, Alfheimr, Hel, Nidavellir, Niflheim and Museplheim--are actual, real-life "Earths", in the sense ...
3
votes
3answers
168 views

Plausibility of (large) continents on a world with hundreds of tectonic plates

Suppose an earth-like world with roughly 500 major tectonic plates. Question What is the plausibility of such a world to sustain (large) continents? Why? Further clarifications: speed of plates: ...
2
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1answer
73 views

Reality check- atmospheric percentages, gravity, mass, and pressure [closed]

What would changing these qualities do to an earth-like world? Would humans and other earth-like life be able to survive, and what effects would this have on them? And what modifications would need to ...
6
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2answers
167 views

Would an underground civilization be feasible on a frozen, sunless Earth? [closed]

If our Sun was teleported away by aliens, would it be possible for people to survive? I'm assuming that humans had prior warning of this ice age (the aliens warned us first) and could drill ...
1
vote
3answers
147 views

What are some artificial Augmentations to stop the Illuminati's Army? [closed]

I am creating a future world where augmentations, all limbs and organs are the newest weapon by bolstering the natural human ability. For example, arm augmentations allow for a strength twice the ...
3
votes
1answer
277 views

Conditions of a more ideal version of earth

What would be the specific conditions required for a planet to be a more ideal version of Earth? I want the world to have a much larger proportion of land covered by lush jungle and forest ...
6
votes
1answer
174 views

Kinetic weapons - establishing an upper limit when dealing with grey goo

This answer to my last question suggested, rightly, that there are targets dangerous, and large scale, enough that there is neither overkill nor spillover damage when it comes to attacking a planetary ...
6
votes
1answer
100 views

Buoyant boulders are being buffeted by bellowing breezes. What can be done to stay un-crushed?

In this world, there exists a type of material that has mass, but is incredibly buoyant in atmosphere. 1 kg of this material attached to 1 kg of any other material will be neutrally buoyant at sea ...
1
vote
1answer
141 views

The Industrialization of Earth and the Effect on Magic [closed]

I am currently writing a story that takes place after what we would call World War Three, in a post-war setting. In this setting, magic exists along with creatures created by radiation from WW3 and ...
4
votes
1answer
110 views

How would a civilization that evolved with access to buoyant building materials approach modern architecture? [closed]

In this world, there exists a type of material that has mass, but is incredibly buoyant in atmosphere. 1 kg of this material attached to 1 kg of any other material will be neutrally buoyant at sea ...
5
votes
6answers
1k views

Can I have a forest in the rain shadow of a mountain range?

I've pretty much finished the map of a world I'm building for a fantasy novel, but I've realised that on one of the continents I need there to be forest on both sides of a large mountain range. I've ...
1
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3answers
145 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
votes
2answers
194 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
votes
1answer
183 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
votes
7answers
865 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
votes
6answers
194 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
votes
1answer
217 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
votes
1answer
213 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
votes
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
votes
2answers
336 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
vote
1answer
168 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
votes
2answers
203 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
votes
1answer
312 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 ...
27
votes
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
votes
1answer
262 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
votes
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
votes
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
vote
0answers
104 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
votes
3answers
210 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
votes
2answers
162 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
votes
2answers
121 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
votes
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
votes
1answer
137 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
votes
3answers
494 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 ...
3
votes
3answers
258 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
votes
7answers
655 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
votes
5answers
171 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
228 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
232 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
votes
4answers
335 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
votes
3answers
620 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 ...