All Questions
Tagged with planets earth-like
129 questions
0
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3
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Day-to-Night observable Sky on a Orbital (non-Niven, small ring) [closed]
I'm assuming a lot of things here, but trying to visualize some characteristics regardless. What would the skyline look like? Day/night, seasonally, etc.
I'm imagining a structure that is a ring, but ...
- 623
-2
votes
1
answer
92
views
Can a planet without a satellite be suitable and how will this affect its climate and appearance? [closed]
I want to create a planet where there will be 2 suns (small races nearby) and without the moon, so that it is very dark at night. But because of this there are many problems with water and geography, ...
4
votes
1
answer
188
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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 ...
4
votes
1
answer
160
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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 ...
- 163
1
vote
2
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222
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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 ...
- 123
2
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1
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432
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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 ...
- 4,454
2
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1
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74
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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 ...
- 4,454
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5
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4k
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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 ...
- 1,871
5
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5
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320
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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....
- 1,550
1
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0
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98
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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 ...
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2
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307
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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 ...
- 8,701
3
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1
answer
492
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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 ...
- 4,454
1
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1
answer
67
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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 ...
- 69
2
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1
answer
77
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How would the synodic period of Venus change if both Venus and Earth were moved equal distances away from the Sun? [closed]
Let us say that Earth and Venus are both moved 10 million additional miles from the sun. How would the synodic period of Venus appear to change for an observer on Earth? If 584 days is Venus' current ...
- 305
2
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2
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196
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What is the maximum percentage of sky that could be covered by a super-Jovian world?
Puffy Jupiters can be huge but the Kepler data suggests that traditional super-Jovian worlds nearer the goldilocks zone, or farther from their parent star, only reach about 10% larger in diameter than ...
- 51k
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4
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254
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What Could Create the Remaining Two Types of Single-Biome Planets?
There have been numerous questions in this SE about single-biome planets popularized in the Star Wars mythos. Despite the criticisms, these worlds are plausible, and they all involve the right ...
- 14.9k
4
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1
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151
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Convection Cells in the Atmosphere of a Jupiter-Sized Planet
Background
The setting for a story I am creating is an earth-like planet near jovian surface area, existing in a universe where the force of gravity is appreciably weaker than in our own, such that a ...
- 452
1
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1
answer
122
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Can a planet bigger than earth exist with same density but with more water proportionally and a lighter core?
By bigger, only the area of the crust is necessarily bigger. Core is necessarily lighter. Everything else could vary.
Can it hypothetically exist?
5
votes
2
answers
1k
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Is a super-Earth with the same gravity as Earth possible?
I'm helping a friend construct a fictional planet for a project, and we've run across a problem. He's looking to create a planet nearly identical to Earth, except only larger. It would need to have ...
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2
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1
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131
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Cutting off a chunk from the north [closed]
I want to make a map of a completely made-up world; the main issue is the island of the elves.
According to their history, a piece of land floated away from the north, and then the "water people&...
- 201
7
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6
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4k
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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 ...
- 1,147
6
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2
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175
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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 ...
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4
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1
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245
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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 ...
- 41
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1
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115
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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 ...
- 632
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2
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435
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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 ...
- 189
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2
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428
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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 ...
- 41
4
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2
answers
189
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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 (...
6
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5
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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 ...
- 5,807
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1
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214
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How far above the galactic plane could an Earth-like planet develop?
I was zooming around on Space Engine and came across the moon of a gas giant that was hovering well above the galactic plane. I'm admittedly not well-versed in under what conditions an Earth-like ...
- 1,659
4
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1
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184
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How large and compact could a cold east Mongolia-like steppe be on an Earth-sized planet?
Welcome to planet X! Planet X is the same as Earth in radius, composition, axial tilt and orbits star Y (identical to the Sun). Planet X has a moon known as moon Z (identical to Earth's moon).
Could ...
- 4,454
8
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3
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342
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How quickly could a rogue Earth return to habitability after a deep freeze?
Background
A large star makes a relatively close approach to a solar system like our own and the orbits of many of the planets are badly perturbed. A planet similar to Earth is in the wrong place at ...
- 38.4k
13
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3
answers
471
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What would the geologic record look like on a planet in the galactic halo?
Imagine an Earth-like planet orbiting a Sun-like star in the inner halo of the Milky Way. As a halo star, it will likely be somewhat metal-poor, having formed early in the life of the galaxy, but ...
- 102k
4
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2
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459
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How does composition change if you extend an Earthlike atmosphere 50km below sea level?
I'm working to design the atmosphere of a fictional planet inspired by Venus (let's call it Cael).
Cael's atmosphere at an altitude of 50 km is essentially identical to Earth's atmosphere at sea ...
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9
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4
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745
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How far should second star be in my binary system?
For a certain reason, I needed two habitable similar earth-like planets very close to each other. After various information gathering, I gave up on double planet and gas giant moons, because tidal ...
- 3,649
8
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3
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446
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Planetizing the World of Jack and the Beanstalk: How Small is Too Small?
We all know the tale of Jack and the Beanstalk--a farmboy sells his cow for some "magic beans", which in turn grow into a mountainously tall stalk that led him to the land of a giant. Now, ...
- 14.9k
4
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3
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226
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is there a way to levitating entire body of water in earth and make it stay in the sky?
as the title, is there a way to levitate entire body of water in earth and make it stay in the sky (not cloud and still in liquid form) ? either natural or man made.
the water either flowing or ...
- 8,897
4
votes
2
answers
379
views
How can I have an Earth-like moon?
My story takes place on the moon of a large gas giant planet. I have been trying to decide on a way for the moon to be as Earth-like as possible, but I have now decided to ask the community for help, ...
- 6,322
9
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2
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1k
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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 ...
- 211
7
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3
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348
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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 ...
- 102k
3
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1
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286
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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. ...
- 31
3
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1
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433
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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 ...
7
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1
answer
364
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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 ...
- 314
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3
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1k
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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 ...
- 1,160
1
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1
answer
467
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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. ...
- 704
1
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0
answers
198
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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 ...
2
votes
2
answers
313
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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 ...
8
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1
answer
210
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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.
...
- 81
4
votes
4
answers
486
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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 ...
10
votes
1
answer
2k
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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 ...
4
votes
4
answers
575
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What requires more destructive energy? Destroying a planet or splitting a planet in half
I just wanna ask which option requires more destructive energy?
Option 1 : destroying a planet like earth to rubble (tiny pieces of rocks)
Or
Option 2: splitting a planet like earth in halves (2 ...
- 49