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Questions tagged [planets]

For questions about any large astronomical bodies classified as planets, and their effects on their systems.

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0 votes
7 answers
1k views

Is it possible to make a planet full of water and at the same time without life?

It's me again, I want to ask if it is possible to make a planet full of water but it has no life, the idea that it is a planet full of water with small islands in which there is no life, here is the ...
Idon'tknow's user avatar
3 votes
6 answers
677 views

Can you have a planet as bright as Venus orbiting at 1.0 AU with no significant atmosphere?

I'm basically trying to have a hot volcanic planet with lots of visible lava within a short distance of my pov planet, so that it would be large in the sky; orbiting at 0.9-1.1 AU. I want it to be ...
Sam Moon's user avatar
  • 601
2 votes
2 answers
97 views

What are some plausible, long-lived geophysical planetary processes which would consistently maintain reddish skies in a human-breathable atmosphere?

Note for clarity: By reddish skies I mean being reddish in the same way Earth's skies are blue. This should apply to the skies in general (not a localized effect), and it's preferable that it's an ...
PedrohSpaceWolfy's user avatar
6 votes
0 answers
107 views

How do Hill spheres work for binary planets?

A small moon is able to maintain a stable orbit around a planet at just under half the radius of the planet's Hill sphere. Most of Jupiter's moons are in this configuration, possibly made more stable ...
Charles Rogers's user avatar
8 votes
5 answers
922 views

Can a Venus-like planet be habitable if it was farther from the sun?

Let's take a planet with an atmosphere as dense as Venus, where there are extremely high winds far above the ground, but it's fairly tame at the surface itself. Perhaps the clouds are made of a nicer ...
Sam Moon's user avatar
  • 601
4 votes
1 answer
128 views

What are the climatic consequences of existing on a planet with a dense and fairly cold atmosphere?

I am making a non-habitable planet (Name: Xoo-akedar) for my solar system. Despite being close to the star (see characteristics below), it has a dense atmosphere that prevents the heat from the star ...
Idon'tknow's user avatar
2 votes
0 answers
50 views

Could a biological organism power itself with electricity like a smartphone (or something similar)?

Imagine an alien world where there are are shallow lakes where electricity generating beings (like electric eels or whatever) would power many of the land dwelling creatures, including the dominant ...
Mishima's user avatar
  • 999
7 votes
3 answers
776 views

Feasibility of a bio-engineered, floating tree lifeform in the Venusian atmosphere?

Would it be possible, given many advances in genetic engineering that today remain speculative, to design a lifeform capable of withstanding the hostile conditions of the Venusian atmosphere? I'm ...
Aeolian's user avatar
  • 71
1 vote
2 answers
190 views

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 ...
Jack Kibatsume's user avatar
6 votes
3 answers
708 views

Frozen World Atmosphere?

There's a planet in my world's solar system that used to be habitable but was knocked off course. its been frozen for about 4 billion years in the present time. I'm wondering if the atmosphere would ...
Raka Holiday's user avatar
3 votes
2 answers
116 views

How to calculate the Draconic month on a fictional world

I am working on a world and want to be able to find out when Eclipses occur, and I found you need to know the Draconic Month, I think I have everything I need to find it, I have the inclination to the ...
DanceroftheStars's user avatar
5 votes
6 answers
3k views

How could Venus be partially terraformed?

In my setting, Venus is still very much still hostile to a normal human without equipment, but isn't hot enough to melt lead and has a relatively low pressure compared to now. How could this ...
user8796978's user avatar
6 votes
1 answer
897 views

Time dilation on a heavily oblong planet

Once upon a time writer Hal Clement had created a world named Mesklin. One of features he didn't detail for historical reasons is a time dilation between polar areas, where gravity is 700g and equator,...
Swift's user avatar
  • 193
6 votes
3 answers
263 views

Can a planet with rings support life?

Is it at all possible for complex life to evolve and exist on a planet with rings? I assume the rings would have to be rock, since if the planet is to support life, it will have to be in the habitable ...
mza's user avatar
  • 161
0 votes
2 answers
92 views

Plausible Martian Underground Colony

I'm looking for scientifically plausible zones for pioneer colonies on Mars. I will have them living underground for radiation shielding, water sourcing, and geothermal for energy, so somewhere with ...
CS Simpson's user avatar
2 votes
1 answer
104 views

Life in the core of a rocky planet

Background First of all, I’d like to state that I know the entire premise of this question is hypothetical and the life probably quite unlikely to form in the first place at best. Despite that, I’d ...
Neil Iyer's user avatar
  • 1,258
1 vote
1 answer
107 views

What are some things to keep in mind while designing a binary planet system with a sun-like star? [closed]

My planets are both the same size as Earth, with about the same water:land ratio. They are tidally locked to each other, but not the star. I don’t know much about planets and orbits and other things ...
Zona C's user avatar
  • 153
15 votes
5 answers
6k views

Life on a planet with never-ending rain

I'm intrigued by the notion of life on a planet where rain is a constant presence. Imagine a world where precipitation never ceases, where the skies are perpetually gray, and the sound of raindrops ...
Alessar's user avatar
  • 521
16 votes
3 answers
5k views

What is the largest fraction of Earth's sky that an astronomical object could take up (visually) before ripping Earth or itself apart?

I know the Roche limit limits how close another planet could get to Earth. Closer than that limit, and either it breaks apart or Earth breaks apart. I don't care what size it is, if it's a super-...
cowlinator's user avatar
  • 1,839
3 votes
0 answers
55 views

Crustal composition of an ammonia planet

I am currently building a planet that weighs about 4 earth masses and is 2.3 earth radii long. It is an ammonia planet (as the title suggests), and has ammonia oceans with some dissolved water ice, ...
Neil Iyer's user avatar
  • 1,258
-1 votes
0 answers
90 views

Can a person hypothetically fly without wings using electromagnetism? [duplicate]

I just realized that I have no scientific reason as to why one of the races on my planet that I am writing can just fly. No wings or anything they just have the ability to lift off the ground and land ...
Sketch Love's user avatar
6 votes
6 answers
2k views

Illuminating Minerva?

It would be convenient for both astrophysics and for the plot of the story set in this world if there exists a ninth planet in the Solar System far outside Pluto’s orbit (with appropriate mass, Ap, Pe,...
controlgroup's user avatar
  • 3,696
4 votes
1 answer
55 views

What should be characteristics of orbit of planet with sustainable climate if north is covered by ocean and southern by desert?

Planet Artemis depicted at my pictures has totally different characteristics of northern and southern hemisphere. Northern hemisphere is covered mainly by ocean, southern by desert (except two seas, ...
GiuseppeZee's user avatar
1 vote
9 answers
1k views

Can I create a world of stationary planets? [closed]

I have created this massive world composed of 15+ planets, all elevated in space, surrounded by stars and countless other uninhabited/desolate planets. Is this even possible? Do I have to create a ...
bookloverKM's user avatar
4 votes
1 answer
83 views

Could a planet with an unusually high heavy metal content sustain life? [closed]

I'm playing around with the concept of a planet containing unusually high heavy metal content, due to being born in a nebula that resulted from a neutron star merger. What conditions would this planet ...
Ellie Cressy's user avatar
4 votes
1 answer
76 views

Necessary distance for an ammonia world from Toliman

I am designing a planet that orbits the star Toliman, (Alpha Centauri B), which orbits well beyond the conventional Goldilocks zone. This planet has a similar radius to earth (6240 km) but its mass is ...
user98816's user avatar
  • 8,593
5 votes
3 answers
1k views

Could mountains form on anhydrous planets?

The primary mechanism for mountain formation (of which I'm aware) is uplift of the crust, with rivers eroding their way through softer sediments as the crust rises to form peaks and canyons. That ...
Rabadash8820's user avatar
12 votes
8 answers
3k views

What would a glassed planet really look like?

While the Halo franchise has used it a lot, other franchises have also mentioned/threatened with the idea of glassing a planet. The sheer heat of the attacks used on the planet to make it ...
Demigan's user avatar
  • 45.4k
4 votes
1 answer
140 views

Procedural Atmosphere for exoplanet - pseudorealistic composition, pressure etc

I have a programme built in python and rust, procedurally generating stars, planets, etc. I have come to a point where I have to work on atmospheric characteristics, hopefully managing to get a pseudo-...
Hal's user avatar
  • 141
-2 votes
1 answer
113 views

Ancient Mars & Human Habitation

Editorial comment: I tried deleting the original question, since in retrospect, and based on responses, it seemed to me to have been pointless asking it. However, I could not delete it. Hence this ...
ajderxsen's user avatar
5 votes
1 answer
161 views

Burning Steel as Firewood

On Planet FeC, residents commonly burn naturally occurring steel ingots as what we would call firewood. As with actual firewood on Earth, these ingots vary in fireworthiness: a large, "green"...
Ray Woodcock's user avatar
1 vote
2 answers
167 views

Large Chasm with water in desert world , temperatures and wind patterns

I'm developing a desert world with polar ice caps, but the majority of the planet is covered in scorching desert terrain. The ice caps, though present, are relatively small, and the areas near the ...
Naima's user avatar
  • 363
4 votes
2 answers
228 views

Does planet size affect mountain formation?

I just wanted to know if the size of a planet would affect the size of its mountains. For example, I know Mars has larger mountains than our own despite being 1/3 our size. Do planets that are larger ...
Tycho's user avatar
  • 103
2 votes
1 answer
293 views

A small planet with earthlike gravity

Is it possible to create an Earthlike planet, that is smaller than the Earth , like for example the size of Mars, by altering the core composition like for example making it: Iron (Piron ): 75.6% ...
Naima's user avatar
  • 363
5 votes
4 answers
884 views

Large-Scale Biospheres on Mars

I've been researching the idea of spreading out vast sheets of aerogel across regions of Mars. This would theoretically have the effect of both warming whatever land is under the sheet - thus melting ...
ajderxsen's user avatar
7 votes
9 answers
3k views

What reasons might day and night be very similar on a planet

I have a planet where I would like the distinction between night and day to be minimal. It is usually bright and it is usually hot. The best I can come up with is a tidally locked planet, where ...
trubliphone's user avatar
1 vote
0 answers
104 views

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
Overflight's user avatar
4 votes
1 answer
164 views

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 ...
Alessandro Miletti's user avatar
6 votes
2 answers
368 views

How do ocean currents work on a tidally locked planet?

I am currently designing a tidally locked world with a big enough ocean to transfer heat from the day side to the night side and vice versa. Here is a map of my world: The darker sides are supposed ...
ΓΙΑΝΝΗΣ ΜΙΧΑΗΛΙΔΗΣ's user avatar
3 votes
2 answers
118 views

How do I figure out where a moon is in the sky at a given time and place?

I use this planetarium tool to see the position of the Moon to check I have it in the right place for a given place and time, for my non-Earth plant. I'm considering having another moon. How would I ...
Syntal's user avatar
  • 53
3 votes
1 answer
185 views

What are the factors/conditions that develop blindness in organisms?

I plan that the creatures of my world are usually blind, so they possess sensory organs (barbels) in several variants. The planet where they are found is cloudy and the peat swamps they inhabit are ...
user avatar
2 votes
1 answer
115 views

At what approximate distance and what size should binary planets be for a day to be no more than 30-32 hours long?

For the story I'm trying to find a more or less plausible description of the planet. Initially I was considering planet size like Mars or mid-size between Earth and Mars. Аnd this planet is in tidal ...
Tanya's user avatar
  • 23
2 votes
1 answer
141 views

Could one moon appear to always follow/lead another in the sky?

Is there any way a second moon would appear to hang out near the closer one in the sky? For example always appearing either ahead of or behind throughout the year, or even alternating between those ...
Syntal's user avatar
  • 53
3 votes
1 answer
184 views

Could a sky be green(day)->purple(dusk)->black(night) and still be breathable?

similar requirements but green. The reason this doesn’t answer my question is because I’d rather not have aeroplankton Similar story with this one and I want it permanently habitable. It takes place ...
Spaghetti_Writer's user avatar
2 votes
2 answers
147 views

What is the albedo of a habitable planet?

What is the albedo range for an Earth-like planet? I need to know because it's important for determining the inner and outer edges of the habitable zone. I'm thinking in terms of cloud/water-ratio (I'...
Sussus Amogus's user avatar
12 votes
7 answers
4k views

What is the lowest tech level that could sustain life on Mars or the Moon?

Inspired by this question, which asks how we could achieve a "backup" of human life. Mars came up as an obvious idea, but with the caveat that it is nigh impossible to keep a Mars colony ...
fgysin's user avatar
  • 3,240
9 votes
13 answers
5k views

If 30% of global military spending for the next 30 years were instead spent on an "intelligent life" backup colony, where should we site it and why? [closed]

Some industry leaders have proposed that AI poses a risk of extinction. Suppose some kind of an AI-related incident occurs that really scares humanity into action, and that this causes the world's ...
phil1008's user avatar
  • 257
3 votes
2 answers
696 views

What atmospheric composition would this planet need for an avg. temperature of 50 Celsius?

Planet Info: Star: 1.25x solar mass / F6V Type / ~6300K / 1.97x Luminosity Planet is 1.84x Earth Mass, same density as Earth Orbiting at 1.42 AU atmospheric pressure is 3.68atm Inputting these ...
Foosic17's user avatar
  • 1,266
2 votes
2 answers
347 views

Can this Star system exist?

Can this star system with this configuration plausibly exist or not? If not please explain why it can't exist or explain its issues. Planetary system Star A 1.1 M⊙ Planets types mass semi-major axis ...
user107608's user avatar
1 vote
1 answer
117 views

How deep can the oceans on my planet realistically be? [duplicate]

I want to know how deep the oceans of my super-Earth can plausibly be. Is there any way to calculate the depth of my oceans? Here are the characteristics of my planet to help with the calculations: ...
user107608's user avatar

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