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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26
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5answers
2k views

Can you add a mini moon to Earth?

So we have had multiple questions on having multiple moons and this is another. I did check and didn't find questions that covered this specific setup. I have an earth-like world I am working on, ...
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6answers
5k views

What would be the tallest possible height for humanlike creatures in earthlike conditions?

This is about "giants" inhabiting a fictional earth-like planet somewhere in the Universe (like those in the movie Prometheus, for example). Assuming that all the conditions (temperature, gravity, ...
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5answers
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How would a civilization that has been living on a “cube” Earth differ from one on a “spherical” Earth?

Another question based off of this one here. Let's say on a cube styled Earth-like planet, there was a similar race to humans. If the differences in the planets were minimal (besides, you know, the ...
37
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5answers
9k views

How would multi-race humanoid evolution happen?

If we were to pull the following races out of a D&D players handbook and remove them from the setting/history of Faerun and look at them from a biological/non-magic perspective (no other planes of ...
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11answers
5k views

Stumped: How can I get a huge Earth-like planet?

I hope this isn't too broad. I would like an Earth-like planet for November's NaNoWriMo that is just enormous, but plausible. Then I started to get into material composition, proximity to the star, ...
14
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2answers
1k views

Orbiting one star in a binary system: what are the effects of the second star on the planet?

This blog post about binary-star systems points out that, rather having the stars be close together, they could be far apart and a planet might orbit just one of them. It gives the example of the ...
52
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8answers
11k views

Creating a realistic world map - Coastlines

Whenever I draw coastlines for a map, I find myself simply drawing large curves and adding in small squiggles in between, occasionally varying things a little for river deltas or small peninsulas. ...
29
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2answers
1k views

Terrestrial Exoplanet Skies – I've Built a Visual Sky Chart. Is it Correct?

I'm an artist and I've been trying to find a comprehensive resource that would help me clearly identify likely sky colors for exoplanets that have atmospheres with a similar chemical composition to ...
15
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7answers
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What if an Earth-like planet had no axial tilt? (climate and technology) [closed]

Hey guys, thanks for the suggestions and answers - here's a more streamlined question - presently focused on implications on climate and technology. I've also added a little more explanation in the ...
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3answers
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What evolutionary factors can contribute to large sexual dimorphism in large mammals?

On Earth, the polar bear is among the most sexually dimorphic animals, with males being on average almost twice as heavy as females (Wikipedia claims average weights of 450 kg for males versus 260 kg ...
16
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6answers
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What would the Earth eventually look like, if it was somehow stripped of its atmosphere today?

Consider the present day Earth. Now, through some event (magic, a giant maid with a vacuum cleaner, a disgruntled alien did it, ...), our planet is stripped of its atmosphere. Assume that this happens ...
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30answers
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How can humans coexist with an intelligent carnivorous species?

This is about a world which is quite similar to Earth in many respects. It has continents, oceans, mountains, fjords, humans, and every other property Slartibartfast might be more or less proud of in ...
14
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4answers
980 views

Do different star types produce plants with different properties?

From this chart it appears that the star types closest to our own are K-type (oranger, a little cooler, and less than half as bright) and F-type (bluer, a little warmer, and much brighter). If I want ...
15
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1answer
2k views

Creating a realistic world map - Waterways

My rivers and streams are just about as good as my waterways - that is, not too good. I do know that their paths are impacted by elevation, so I generally determine the elevation of an area before ...
31
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14answers
6k views

Just how unrealistic is a hovering city?

In my last question, we had some disagreement in the comments about the reality of a hovering city. However, that question wasn't about that. This one is. My civilization are building a giant ...
13
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2answers
545 views

Does a planet's axial tilt and seasonal progression affect a planetary-ring system, as seen from the planet surface?

Ok, so I have determined my world can keep it's planetary ring system. YAY! Now I just need to clarify once and for how it would look like from the planet surface. I think I have it worked out, but ...
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18answers
6k views

How to explain the co-existence of peace and violence in religion

If you look at religions in world history they are often a source of conflict. Disclaimer: Obviously this is not true of all religions nor is it a judgement on those religions for which it was or is ...
26
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6answers
7k views

Can every animal eat most other animals?

An idea for a story I’m working on involves a far away world that was once inhospitable. Scientists - likely alien ones - terraformed it so it could support life (coincidentally, Earth-like life). ...
14
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5answers
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Can a habitable planet have mini-suns (i.e. solar satellites or glowing moons)?

Suns are stars. They are orbited by planets, and sometimes other stars. Planets are orbited by moons. Reasonably advanced civilizations may launch artificial satellites into orbits around their planet ...
19
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4answers
991 views

Earth-like Moon around the Gas Giant. Eclipse length?

Worldbuilder in dire need! I'm trying to figure out the eclipse length of a habitable Earth-like moon that is rotating around a gas giant. The story that I work on is centered on the Earth-like moon, ...
10
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2answers
2k views

How to build a floating farm?

This is one of a series of questions also discussing mosquito prevention and city building. There is a civilization indigenous to an area like the whitewater flooded forests of the southern half of ...
41
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16answers
7k views

What could cause an avian species to become intelligent?

There have been a few questions about an intelligent avian species lately and they have gotten me thinking. It seems to me that it would be hard for an avian species to evolve to be more intelligent ...
22
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1answer
5k views

Creating a realistic world map - Vegetation/Biomes

My world is progressing. I still have a couple of days before my deadline to finish it. If I can make it in less that 7 days, the other gods will be impressed. My world have continents with ...
16
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3answers
791 views

What common structures and systems exist in global organized religions?

I am working on developing the cultural framework for my world and I have a singular religion in mind that plays a role in both the story and more relevantly the state of the world. To provide the ...
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4answers
2k views

How to create the eternal storm?

The Great Red Spot on Jupiter and the numerous Great White Spots on Saturn are storm systems that encircle the globes and last for decades, centuries in Jupiter's case. These are formed on Gas Giants ...
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4answers
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Planetary colonization by a female crew

I'm working on a planetary colonization story where a crew of 36 women are sent to populate an earth-like planet. The crew takes with them the tools needed to survive the first years. Enough to build ...
12
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2answers
18k views

How much force needed to blow open a planet?

I recently asked this question about what would happen if a fusion bomb went off in the core of a planet, and the answer was relatively uninteresting. As was aptly said in my previous answer, the ...
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14answers
9k views

How can I explain a planet with perpetual rain?

I was planning a short story that focuses on a rainy day in a city, and I realized that there's one interesting feature of it: Even though the weather seems bleak, and it affects the actions of those ...
11
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4answers
2k views

A world with a moon orbiting much closer than ours

The world I am envisioning is a rocky planet with oceans, plate tectonics, atmosphere, and several other similarities to our globe. The mass and size is roughly equal, but its moon is orbiting much ...
28
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5answers
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Humans born without legs: how would they thrive?

or, Anatomically Correct Weebles A group of behaviorally modern humans was cut off from the rest of the earth-like planet millennia ago. (Myths hold that the separation occurred four to five ka BP, ...
6
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3answers
514 views

Maximum number of earth-like planets in a system

I am trying to build a planetary system with a maximum number of earth/near earth like planets/moons. What would the maximum number of possible earth like planets be? I am assuming that some would ...
5
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3answers
533 views

At what distance from these planets should this moon be placed?

I have two earth clones, in essence, separated by 16550 miles (26350 kilometers). They are, of course, tidally locked, and orbit each other once every 24 hours. These planets orbit a sun identical to ...
16
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9answers
4k views

How could a Great Chasm be created?

As one of the feature in my world, I want to create a very deep chasm, as deep as possible. If it can touch the core, it will be perfect. Size does not actually matters, although I think the ...
14
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9answers
825 views

What can I add to an oxygen/nitrogen atmosphere to make it unpalatable or poisonous to humans, yet stable and breathable to local creatures?

I have a roughly Earth-like planet in a solar system some distance from ours. The atmosphere of this planet is largely similar to that of Earth, but particularly, has a somewhat higher oxygen content; ...
10
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5answers
440 views

Which astronomical or cosmological event would explain periodical low-grav-effect on earth-like planet?

Imagine an earth-like planet on which gravity is reduced by 20%-30% every 15 months. The low-grav-effect should start slowly, reaching its peak/bottom of round about 0.7 g after 6 weeks and should ...
8
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1answer
1k views

Physiological effects of living on a world close to a black hole

Let's say you were living on a planet near (but not too near) a black hole. I'm thinking of the planet Miller in the movie Interstellar. Obviously there are some strong tidal forces. But at this ...
7
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2answers
668 views

The World's a Jungle Again. Would Doldrums Blow the Global Air?

From 56 to 34 million years ago, Earth was so warm that we have found evidence of jungle plants inside the Arctic Circle. Nowadays, jungles are confined in or near the equator, and those latitudes ...
5
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8answers
621 views

Can a city in a flood plain be maintained for centuries if it is built on stone blocks?

This question is part of a series that includes mosquito prevention and agriculture. The environment is a rain forest basin, similar in many ways to both the Amazon and the Congo. There is a mighty ...
2
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3answers
652 views

What would happen to an urban fantasy Earth hit with a supernatural, planet-sized EMP?

Assuming a modern urban fantasy setting (thus, the world is "ours" in the present time, with the known continents, cities, technology, and general environment), what would happen if a supernatural EMP-...
58
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19answers
9k views

Would it be possible for an Earth-sized world to speak a single language?

We have thousands of languages in the world, which seem to have evolved differently due to lack of communication methods (it wasn't quite easy for a Chinese guy to speak with French people thousands ...
24
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8answers
1k views

How do I blend cultures - naming world features?

In my world I have a variety of nations and city states but I also have a history/background that means they are not and have not been completely isolated. In fact there was once a continent spanning ...
24
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11answers
4k views

How does a Blood Shaman gain his power?

Background There exists a continent on the scale of Eurasia, which spreads from tropical regions to polar. It has the full range of biomes that we find on Earth. On this continent, there are many ...
27
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14answers
7k views

Could the Industrial Revolution be delayed indefinitely? Or is it inevitable once a certain point in development is reached?

I am considering whether a pre-Industrial civilisation could carry on for millennia on an Earth-like planet without entering the Industrial Age. Of course, regularly destroying everything with ...
19
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7answers
4k views

What's the quickest way to add oceans to a planet?

After writing this question about the ecology of a terraformed planet, I realized that I hadn't quite tied up all the loose ends of the terraforming process itself. I intended for a group of aliens ...
17
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3answers
5k views

What would the effects be on a earth-like planet if the magnetic field was much stronger

The hypothetical world is for all intents and purposes earth or very close to it. So what would the effects be if the magnetic field were either stronger from the start of the planet, or if the ...
12
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1answer
490 views

Choosing axial tilt for human habitable planet for largest temperature variations

I have planet with twice the radius of Earth, with its core being the same absolute size as Earth's in order to provide magnetosphere, and the rest of the planet made of silicates like Earth's mantle. ...
12
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6answers
713 views

Generating a Magnetic Field Biologically

I was answering this question about how a living planet-organism could be possible, and realized I didn't know how such a planet-organism could produce a magnetic field. I postulated that it could ...
10
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3answers
1k views

The view of the sky from an Inverted/Hollow Earth?

Obviously there are plenty of potential physics problems with this scenario, but if people lived along the inner crust of the Earth, and there was a Sun-like core at the center with nothing else in-...
14
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7answers
810 views

An enviroment where a bird-like creature can survive on passive feeding

The question about a diet of dust brought up a few creatures that survive on dust, however they were all insect-sized or smaller. This got me thinking about the Blue Whale, which survives on a diet of ...
6
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1answer
3k views

Can you help me design a realistic climate map for my world (alternate Earth)? [closed]

The setting is a sci-fi/fantasy future Earth ( ~5 million of years in the future) so mountain chains and general elevation is more or less the same of our own Earth, just out of position due to a ...