All Questions
272 questions
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How long would an eclipse last on an Earth-like moon [duplicate]
I’m creating an earth-like moon that orbits a gas giant planet the size of Jupiter. The planet orbits its star at the same distance mars orbits the sun and it takes the moon 295 days to orbit its ...
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4
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2
answers
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Is this solar system mechanically possible?
Say, hypothetically, you have two terrestrial planets (b,c), one gas dwarf(d), and one gas giant(e) all orbit the habitable zone in some manner.
b, c, and d all have an orbital resonance, which cause ...
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12
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3
answers
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What unique phenomena would be observed in a system around a hypervelocity star?
A star is ejected at a high velocity from the Milky Way Galaxy, going towards Andromeda at a significant speed. Around said star is a stable planet - that either at the time of ejection or is made to ...
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-1
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1
answer
133
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How long would it take for an Earth-like planet to become uninhabitable if another sun suddenly appeared? [closed]
Context: this event is set in a world that I am going to call Earth-like enough. The only important distinction about this planet is that there is a cluster of floating islands held aloft by ancient ...
user115728
0
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0
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59
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What would the weather and climate be like on an Earth-size Mars with an atmospheric pressure of 1 atm? [duplicate]
Assuming the planet still has the same atmospheric composition as the real-world Mars (95% CO2, 3% N2, and 1.3% Ar) and has a global temperature of 284K (10.85°C) based on the answer to my previous ...
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7
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3
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What if Mars were the same size as Earth with an atmospheric pressure of 1 atm?
With the abundance of carbon dioxide, and yet being 1.52 times farther from the sun, would it make the Martian temperature cold or hot?
I am assuming that the composition of the atmosphere remains the ...
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1
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92
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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
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2
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125
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How to prevent ice caps from forming on cold planets?
I am currently working on one of the planets in my system, called Opea. Opea is a roughly earthlike planet in the furthest edges of its star's habitable zone (receiving half the sunlight as Earth), ...
0
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1
answer
130
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How would a monster be part of a planet's core? [closed]
Okay so I know this absolutely isn't possible but what is the most likely way this would be possible? This idea is also very much still in progress but I think asking this would help. I'm thinking of ...
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1
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2
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363
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I have a world with two moons, and I was wondering how often they would both be full at the same time
As I said in the title, I have a world with two moons. One has an orbital period of 17 days Earth days (Moon 1) while the other has an orbital period of 57 Earth days (Moon 2) and the planet they are ...
1
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0
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114
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what shape would a planet entirely dedicated to watching be [closed]
If I have a planet fully dedicated to watching (think the Eye from Magnus Archives) what shape would allow for constant observation of the whole planet from some sort of tower
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4
votes
1
answer
174
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Could a planet be ejected from a system by a rogue planet? (possibly in a binary pairing)
Assuming an earth-like Solar System with an earth-like planet, would it be possible for a rogue planet travelling at a high speed to disrupt the earth-like planet's orbit so as to leave the solar ...
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0
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2
answers
112
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Auroras of a planet around an active M7 red dwarf
A planet the size of earth around a pretty active M7 red dwarf (think of M to X level flares almost every day) has a decent magnetic field of 0.5-0.8 Gauss, orbiting at a distance of 0.0443AU, with a ...
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6
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6
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2k
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How possible is a habitable, liquid ocean-planet at temperatures below 0°C?
I plan on having an ocean-planet with a breathable atmosphere built into my current setting, orbiting its host-star (a K4v main-sequence star) a short distance beyond its frost-line, with oceans that ...
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1
vote
2
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159
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Reverse engineering the Hill Sphere?
I'm wondering if anyone has run into the issue of "I know the general idea of how big my moon is but not the parent planet" and how to sort of reverse engineer finding out the mass/radius of ...
1
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1
answer
101
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Could I figure out the sun's size in the sky based on the planet's radius and its length of year?
I know the planet's radius and how long it takes to orbit it's sun, could I use this information to then work out the size of the star itself and how large it would appear in the sky or would I need ...
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5
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2
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410
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How close can two planets be within the habitable zone?
I am aware that similar questions have been asked but these variables are different. I have tried to calculate it myself or at least find an equation that could help find the forbidden zones for these ...
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1
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2
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185
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What would happen if a Europa-like moon "thawed"? [closed]
I have a planet and moon system orbiting a high mass star, something like a type A main sequence. Everything is only a short two billion years old, but the star is already starting to expand, warming ...
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2
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3
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702
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How far in between a K-Type Star and a Planet would there need to be in order for there to be a very rare eclipse inside a S-Type Binary System?
Here I have posted a diagram I have made for my planet's solar system that I think may be correct.
For background understanding: My Main Planet is orbiting a G-Type Star in this binary system, whereas ...
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2
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3
answers
193
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Does my binary planet make sense?
I have a binary planet as the setting for a sci-fi story, and I would like to know if this system makes sense or if there are any major flaws. I am also open to suggestions for improvements.
Here is a ...
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7
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2
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Would a rogue planet experience more asteroid collisions?
I'm working on a novel where the characters inhabit a rogue planet. Would that planet get hit by more asteroids due to the fact that it isn't orbiting a star? I have a feeling that the distance is ...
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6
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2
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438
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Effects of Superconducting Rings to create a magnetic field around a planet
Continuing along my oft-contineud series of questions relating to terraforming, I return to an idea of giving Mars a magnetic field which I had hitherto dismissed. The idea is that a huge ...
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5
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3
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323
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is it possible for a binary planet system to have long term moons orbiting only one of the planets?
What I'm thinking of is a binary planet system each with rings, 2 moons orbiting the larger one and one moon orbiting the smaller one.
The mass of the larger planet is 5 Earth masses, while the ...
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7
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2
answers
538
views
How much radiation would a pulsar planet receive?
I have a planet, let's call it Davy-Tim. Davy-Tim has 2 times the mass of the Earth and has a magnetic field. Davy-Tim has a negligible atmosphere and orbits an average millisecond pulsar named Dad, ...
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17
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5
answers
3k
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Where could we add a new planet to the inner solar system?
Assume there was a super advanced alien race that for some reason, wanted to add a new planet, of lets say 1 Earth mass, into the Solar System. Where in the inner Solar System (The part of the solar ...
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2
votes
0
answers
86
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Other types of planetary systems? [closed]
I recently watched Artifexian’s video about other planetary systems, and I’d like to know more about those types mentioned and if there are any additional types I should know about. (I’ve heard that ...
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2
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207
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Help me create a more believable artificial planet
Ok, I noticed some very intelligent answers on this platform and I would love your input on the planet for my book trilogy. I have been working on the blueprint, story structure, and characters for ...
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3
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4
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599
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Day/Night on a Ringworld
In writing up an idea for living on a Ringworld, I've come to an odd question; Is there a moment of decreased exposure to the sun? I've seen this question asked previously, but people simply refuted ...
5
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1
answer
239
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Daily eclipses for a moon orbiting a gas giant?
I've dug into the idea of a habitable moon getting daily eclipses due to its gas giant getting in the way of the sun; but most examples I've found specify a tidally locked moon. I'm no astrophysicist ...
9
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8
answers
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Would it be possible to have 3 planets that could be colonised by humans in the same system?
I’m looking to create a situation where there are 3 habitable planets (or moons) in the same system, each with different inhospitable but habitable (by genetically modified humans or humans using ...
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4
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1
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335
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How would I calculate the greenhouse effect based on atmospheric composition?
Problem: For a known, but hypothetical planet orbiting a celestial body, how would I calculate the surface temperature after greenhouse gases?
What I know about the planet as given:
Planetary ...
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4
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2
answers
177
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Would seasons be affected on two planets sharing the same orbit?
I'm writing a science fantasy short story where two planets share the same orbit (ie, they don't orbit around each other, then orbit their star, they orbit the star, but one of the planets follows ...
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0
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210
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Questions about the potential characteristics of a hypothetical Planet 9 [closed]
So, I'm writing a story. Most of the main story is set near Planet 9, which has finally been found somewhere far out in the outer solar system.
So first, I’ve been working on determining the probable ...
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1
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Short and long term effects of an Earth sized planet entering Earth's orbit [closed]
In this scenario a Earth analog planet is accidentally pulled into Earth's orbit through the creation of a wormhole. The planet would orbit Earth at about 80,000 miles (128747.52 Km). The planet has ...
1
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2
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319
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The Geodynamics of Tidally Locked Planets
Would the tidal forces of the star a tidally locked world orbits have any effects on the Geodynamics of the planet?
I imagine that the tidal forces would pull the crust thin at the Terminator making a ...
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4
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3
answers
205
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Is this method of “burial” possible?
Now that colonization of Mars and The Moon is starting to pick up, lots more people will start dying. LifeHarbor Burials™ says that they will provide a way to dispose of the dead for free.
They claim ...
- 2,356
4
votes
2
answers
335
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How long can this planet hold its atmosphere?
Humans are looking for a permanent home. They colonized Mars and later terraformed it, temporarily, before being forced out of the solar system entirely when the Sun went all Red-Giant on them a few ...
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6
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3
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Where would be the most likely location for an early Mars base?
Quite simply, given considerations like radiation protection, locations of scientific interest, local resources for building construction, water, propellant production, mining, etc, what would be the ...
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4
votes
1
answer
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How many habitable planets could our radio signals reach?
Taking into account signal attenuation.
If there was anyone there to hear them.
Only considering those signals already produced by us on Earth.
Assuming the technology we have right now is available ...
- 10k
8
votes
2
answers
341
views
Can I reasonably give a binary/double planet a strong magnetic field?
If there was a double planet with each mutual satellite being the mass of the Earth could they still maintain Earth-like magnetic fields despite being tidally locked to each other?
Simulations of how ...
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2
votes
2
answers
134
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Tools for workshopping celestial body orbits
I am working on a scifi setting that mostly takes place among the moonlets and boulders of a gas giant's ring system. The humans living in this world travel slowly, in primitive spacecraft, between ...
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3
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1
answer
380
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How would a near light speed impact on Jupiter affect the planet and the solar system? [closed]
The object was originally "fired" as a weapon used from space to hit planets.let's say it is a long cylinder with a very high density and it was accelerated at some point to 90% of C.
The ...
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2
votes
1
answer
135
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What will be solar eclipse on a planet with two Suns, no moons and tidally locked to one sun?
An earth sized planet in the habitable zone between two stars has no moon (and even if it has, it is not significant to the story) and is tidally locked to star A but not star B. Can it still have a ...
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2
votes
2
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191
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Is it possible for an ammonia planet to have a desert spot? Like the great red spot on Jupiter. Or can an ammonia planet never have any hot spots?
I have an ammonia planet that I want to have a desert spot. A hot desert. Can I tidal lock the planet to it sun and let that particular portion be hot? Or is there any other way? Or is it never ...
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3
votes
5
answers
1k
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Chance of a breathable atmosphere of any given planet in our galaxy
It is a common trope of science fiction that a space ship or shuttle crashes on a nearby planet, and for the human occupants to step outside and comfortably breath the planet's atmosphere.
My question ...
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5
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A planet with toxic air
I just started thinking about a fictional universe where humans have colonized more or less any habitable planet (there is a huge concentration of habitable planets) and I'm trying to write down ...
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4
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1
answer
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What would the atmosphere of the Archaean Earth look like? (Before massive oxygenation)
I am designing an exoplanet in the Alpha Centauri system that is remarkably like ancient Earth before photosynthetic life developed and proliferated oxygen into the air.
For Archaean Earth's ...
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4
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2k
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Probability of a spaceship stumbling upon a random planet?
In an intergalactic federation, space ships are extremely common. They run supply routes, defend planetary bases, and transport colonists to new worlds. To aid in these adventures, most ships would ...
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3
votes
1
answer
460
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Is This Desert Planet Realistic?
Okay, I have a desert planet that orbits an M0 star and an G0 star at an circumbinary orbital radius of .9 AU from the shared center of gravity of its twin suns. It’s tilted on its axis by 23.5 ...
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2
votes
1
answer
532
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Climate of a Planet in a Binary Star System
Would the climate of a planet in a binary star system consisting of a K star and a G star be affected by the binary system? By this I mean, does having two stars at the center of a solar system affect ...
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