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.

Filter by
Sorted by
Tagged with
3
votes
1answer
58 views

A planet with flying witches on broomsticks - or are they?

NOTE My question is different from this previous one. What could be the physics behind witches flying on broomsticks? It is different because the phenomena in my question are not actually witches - ...
0
votes
0answers
19 views

How would two moons in horseshoe orbit impact calendar development? [duplicate]

I've decided that the habitable planet I'm writing will have two moons in a horseshoe orbit, and I’m trying to understand how this moon configuration would impact the development of a calendar system ...
2
votes
1answer
65 views

Two large moons in horseshoe orbit possible? What effect on humanlike life?

I've decided that the planet I'm writing will have two moons in a horseshoe orbit, closely modeled off of Saturn's Janus and Epimetheus. For the purposes of this question, I'll be calling them Moon ...
2
votes
5answers
479 views

What percentage of NPCs does a god need in order to remain benevolent?

A god (G) of an Earth-like world is benevolent. At the same time G allows free will. The problem is of course that some people will choose to harm others. This presents the god with a problem; how ...
1
vote
3answers
146 views

Making ice in the tropics

My characters live on a tropical island on another planet. Although civilized, by their standards, they have not been through an iron age or bronze age since the metals oxidize when exposed to their ...
7
votes
6answers
3k views

How Big Can a Habitable Planet Get Before Its Gravity is More Than 0.8 m/s² above Earth's 9.81 m/s²?

This is NOT a repeat of this question. I am NOT looking to see the smallest planet possible that has less gravity than Earth. I am looking for how big a perfectly habitable planet (Habitable meaning ...
3
votes
1answer
97 views

Climates of a Eurasia-like continent in the tropics

I'm working on an earth-like world that has a two main continents akin to Eurasia+Africa. but centred on the Equator. Basically, the premise is to shift the east-west axis of diffusion that exists on ...
3
votes
3answers
210 views

What would Earth look like if its rotation was inverted? [closed]

Let's say we are in a parallel universe: we have an exact copy of our solar system, galaxy and so on. The only difference is Earth: it rotates on its axes the other way around (to be more clear, in ...
13
votes
7answers
2k views

Physical explanation for a permanent rainbow

I am trying to create a world where, on a Earth-like planet, a certain area experiences a peculiar phenomena: year after year, in a given period of the year, for a certain number of days (greater than ...
3
votes
1answer
77 views

What type of biological changes would need for animals to move earth-like on a terraformed mars?

Assuming Mars was successfully terraformed. It has earth-like atmosphere composition and density. Plant life is abundant. My question is what type of biological changes animals (and birds; not humans) ...
2
votes
2answers
76 views

How to model an earth-like planet with extreme winters in the northern hemisphere?

I want to create a planet where there are extreme winters (3 months with temperatures up to -40°C) at around 50° latitude. The summers are just slightly hotter (a day of 30°C in the summer would not ...
2
votes
1answer
99 views

How would monsters realistically exist in our world? [closed]

How would monsters exist in real life? Setting: The world is like ours, but with some changes. The geography is as if the tectonic plates did a different thing, the plants are similar but there also ...
3
votes
3answers
125 views

is there any way to make an earthlike planet (aside from the atmosphere) have a green sky at noon and a pink sky at dusk

im working on a mostly earthlike planet (aside from atmosphere) have a sky that looks green at noon to humans and pink during a sunset? could it be done via airborne algae? would the atmosphere still ...
0
votes
1answer
103 views

Alternative earth-like planet environment that supports human life

So i want to create a planet that supports human life. Primarily, i would need to consider a star type, an atmosphere, foliage pigment, and potentially different types of plants. Think of it as a sort ...
3
votes
0answers
122 views

Effects of a large, equatorial freshwater sea on the surrounding ecosystems [closed]

So, first let's imagine an earth-like planet (roughly the same size and axis tilt, presence of a moon, etc). The majority of the landmasses on this planet are in the southern hemisphere, and unlike ...
4
votes
2answers
124 views

How to reduce the greenhouse effect while keeping the same amount of CO2?

So in my story, a group of people must colonize a planet that is habitable with a lot of sources of water and oxygen, and they need the right temperature, but I wasn't able to calculate the Greenhouse ...
2
votes
3answers
112 views

Damage estimate for a large acetylene explosion

In a laboratory in a university building, a gas tap is accidentally opened at the end of the working day. The gas tap is connected to a bank of large acetylene cylinders. The gas tap is ejecting 0....
21
votes
13answers
9k views

If you lived 5,000 years, would you notice the continents moving?

I am trying to develop a story where it is based on Earth around the 42nd century and can't figure out if the continents would have made any noticeable/notable shifts. Any help is appreciated. Edit: I ...
3
votes
2answers
98 views

How would a human body behave if the atmosphere pressure were 2Atm at the sea level?

I am wondering if on an otherwise Earth-like planet the atmosphere pressure were constantly 2Atm at the sea level, how would a human body behave if we landed there? Suppose the air composition would ...
6
votes
2answers
94 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 ...
7
votes
5answers
283 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
votes
1answer
280 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 ...
7
votes
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
votes
1answer
89 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 ...
2
votes
1answer
71 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
votes
1answer
101 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
votes
4answers
307 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 ...
5
votes
5answers
209 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 ...
11
votes
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 ...
1
vote
2answers
99 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 ...
1
vote
2answers
376 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 ...
3
votes
3answers
138 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 ...
1
vote
2answers
196 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 ...
7
votes
6answers
1k 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 ...
4
votes
2answers
92 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 (...
10
votes
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
votes
1answer
70 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 -...
3
votes
2answers
135 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....
19
votes
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 ...
3
votes
1answer
125 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 ...
4
votes
3answers
151 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 ...
6
votes
5answers
639 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 ...
19
votes
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 ...
2
votes
3answers
90 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 ...
6
votes
4answers
744 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 ...
1
vote
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 ...
47
votes
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
votes
2answers
265 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
votes
1answer
157 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
votes
1answer
98 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 ...

1
2 3 4 5
14