Questions tagged [planets]

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

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How would planet Earth reason with people? [closed]

Let's say that...Planet Earth has a soul, and is a little more than a fat rock floating in space. And that around the begining of the carboniferous period, Earth was very curious to know what this ...
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Earth-sized Moon with Host Planet launched from Star System

Could a planet with the size and characteristics of the Earth orbit a gas giant and would the earth-like moon be able to maintain its orbit if the gas giant went rogue and was launched from its host ...
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Are these traits for my planet mathematically accurate? Could it support life?

Mass of star: 0.75 M☉ Radius of star: 0.69 R☉ Surface temperature of star: 4,620° K Luminosity of star: 0.2 L☉ Satellites: 2 Place in solar system: 2nd Mean radius: 8,725.1 km Mass: 2.57 M⊕ ...
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Properties of an Argon based gas giant

I am writing a novel where a habitable moon orbits a purple gas giant. In looking here and elsewhere I'm finding it incredibly hard to get a sense of the elements-breakdown of elements that would be ...
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1answer
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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 ...
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Would a civilization living on a planet without a moon still come up with the concept of months?

We divide the year into months of ~30 days because that’s roughly the period of the moon, adapted to fit a solar year. However, would a civilization living on a world with no moon but a year of ~365 ...
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1answer
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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 ...
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4answers
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Stranding my colonists on an alien planet they were supposed to eventually inhabit [closed]

So the background is that a colony ship has arrived in the orbit of a habitable, Earth-like planet. The colonists are in cryosleep and are being woken up in batches. An initial round of scouting the ...
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How can a rogue planet get energy for plants to use?

This rogue planet is a cold rocky world where liquid methane replaces water, hydrogen is used in place of oxygen, and a large moon. I was thinking the large moon would have a large tidal pull that ...
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Greenhouse Effect Strength- Ammonia World

I've been working on designing how an ammonia-ocean world might work and I've settled basically everything except one. I cannot for the life of me find any sources that actually provide a decent way ...
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When earth is filled to the brim with plant-life, can it cause a hyperoxic environment?

Say humans found a way to exponentially increase the capability of plants to grow. Is it possible for it to cause an environment that can cause oxygen toxicity in humans?
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Putting together a research expedition to an alien planet - what kind of scientists am I taking with me?

It's the 22nd century and we have discovered a derelict alien craft somewhere in the Oort cloud. The craft contains a star chart showing its origin on an alien planet some 30 light years away. Let's ...
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Temperatures on an Earth with a week-long rotational period

To make things simple, assume Earth had a slower rotation than it does. How would that affect daily highs and lows in temperature? Is there a simple way to figure it out? Was thinking a week-long ...
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Would it make sense to send potential human colonists on the initial manned expedition to a habitable, Earth-like planet?

In the near future, humanity has spread out across the Solar System. A new planet is discovered, let's say 30 light years away, that shows it to be Earth-like and could harbor Earth life without too ...
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How great could tides be on Earth (or an Earth-like planet) if you swapped the Moon? [closed]

Assuming a planet would have Earth's surface gravity and about the same share of it's surface covered by water, how great could you make tides if you could make the moon bigger, smaller, denser, less ...
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How can humans actively tidal lock a planet? [duplicate]

How can humans (like that that are on Earth now) stop planet from rotating (tidaly lock it, to make an eyeball planet)? Is that technologicaly possible? Can moons of that planet help them? They want ...
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A world that exists within the crust of the earth [closed]

Let's say that world was created where life existed within the crust of the planet, rather than on the outside, what would the ramifications be? I am hoping for someone with an education in some of ...
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Is my planet realistic?

Is my planet realistic? It doesn't need to be able to support life as it's just another planet in my solar system, but is a planet with such a high density and gravity really possible? I calculated ...
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What is the tallest mountain possible in any gravitational environment?

In world building it is often interesting to consider extreme landscapes – how tall can a mountain be on Earth for example. But what is the tallest mountain possible in any gravitational environment? ...
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Is it possible for a planet to only support liquid water at the poles?

Could a planet be hot enough that oceans could form at the poles, but would boil at the equator? And would oceans form at all on this planet?
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Could habitable planets form in an ultracompact galaxy?

I am wondering if habitable planets could form around stars in super dense dwarf galaxies. There are some super dense galaxies such as M60-UCD1 and M85-HCC1 which can have a typical distance between ...
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Is there a plausible way to have a Gas Giant with two or more earth to mars sized moons orbiting it in the Habitable zone?

A hypothetical scenario I'm batting around in my head is a Habitable Gas Giant system consisting of a roughly Saturn sized body orbiting a sun like star at a comfy goldilocks zone distance. Orbiting ...
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I want ten Earth-years long day on my planet. Can I have it?

I need ten Earth years long day-night cycle on my planet. Hemera is a world I am creating as a setting for my story. Name comes from Greek deity - personification of Day. Needs of storytelling have ...
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383 views

Distance from Jupiter to minimize destructive tidal forces

There is a video from "What If" that tells about (precisely) "What if Earth was a moon of Jupiter":What if the Earth Was a Moon of Jupiter And, in a short story I am writing in an alternate reality I ...
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Can a perpetually darkening atmosphere exist and yet still allow life to evolve?

I am creating a science fiction worldbuilding project, in which humanity has colonised distant exoplanets. One such planet is a Venus-like planet in the sense that it has a perpetual cloud cover, ...
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Would a life-bearing Earth-like world with 3g average gravity produce more or fewer flying creatures than Earth?

On one hand, heavier gravity would make flying more difficult, owing to greater weight restrictions on the flying creatures' bodies. On the other hand, the greater density of the atmosphere on our ...
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How did aliens on a habitable planet hide themselves during the recon and scouting stage by human colonists?

We've found a habitable planet orbiting a red dwarf star some light years away and conditions are Earth-like enough that a colonization project was initiated. Before any humans landed on the planet, a ...
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Making the exoplanet with the most complicated seasons

I was wondering how/if it would be possible to create an earth-like (atmosphere, gravity, average temperature, etc. are close enough) rocky exoplanet with more than two or three significant ...
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Is it possible for a planet to have an area saturated with lava but at the same time is still habitable to humans and other lifeforms?

An area of my planet is very saturated with lava. Being quite similar to the Siberian Lava Traps, it is essentially a lava sea. This lava “sea” area isn’t necessarily all lava however, as there are ...
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I'm formulating a planet that has silver dust on its surface, and ideally has rivers of mercury flowing on it, possible? Human survival not necessary

I'm new to this and my scientific knowledge is massively lacking in this area (so please take it easy on me!) I'm writing a historical science-fiction novel. Parts of it set in the past (1977) and ...
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Giant planet renders one side of its moon deadly, the 'shadow side' habitable. How?

My project concerns a world "A", that is a moon of a gas giant "Jovi", in a solar system with no other planets to speak of and a host star much like our own. "A" is Earth-sized, has no magnetic field ...
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How Would I Believably Wipe Out an Entire Planet's Population and Culture Without Destroying Said Planet?

In my story, there is a planet. The planet's name is not really important for the sake of this question, so we're going to refer to it as "dead planet". Background: Dead planet is entirely hot ...
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How Would I Make an Oceanless World Feasible?

The planet I'm thinking of is of similar size and distance from its star relative to Earth, but it lacks oceans, instead consisting of one massive continent with a huge mountain range (reminiscent of ...
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How to Calculate Apparent Magnitude/Brightness of Planets from Within the same Solar System

I'd like to be able to determine the appearance of the night sky from an Earth-like planet, in a solar system with multiple other planets, moons, and other bodies. Here on Earth, we can directly ...
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Binary Star System Build - Alpha Centauri

I'm not sure if this site or Astronomy would be better, but I figured I would try here instead. I am attempting to create a [semi]plausible star system in Alpha Centauri for a series. The system was ...
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Can a square world/planet work? [duplicate]

I'm working on a idea of making a half square/cuboid, half sphere world. The shape of it will be like this from the side and I'm planning to make the cuboid side the main area where my story and ...
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2answers
143 views

Plausible reasons for a whole planet to have a temperate oceanic climate?

In my book series, I’m worldbuilding a planet whose culture is based on Celtic mythology and history, and in order to be consistent with real life I feel like the whole planet’s environment needs to ...
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Would these processes be probable on this planet?

Background This planet, located somewhere in the Andromeda galaxy, orbits a M5V star about 0.682764 AU away from its star. The planet is volcanically active due to the gravitational field of the ...
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Feasibilty of binary planet having life

So far I've designed two planets, and would like for them to orbit each other at a distance of roughly 1.25 million km (both planets would easily stay in the habitable zone), the smaller being tidally ...
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How massive would a planet need to be to sustain negligible damage from impact with the Earth?

I'm curious what factors a terrestrial planet impacting the Earth would require for the impact to cause negligible damage to the larger planet, while destroying the Earth.
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Consequences of hitting a Pluto-like planet with a highly luminiferous meteorite?

While the intended end state is that this planet can support space-faring lifeforms, the solution under question needs a sanity check. I cannot commit to many numbers with how speculative this all is ...
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What are planetary side effects of having a thicker atmosphere?

I've been told that having a thicker atmosphere would make it easier to fly, particularly of heavier-than-air designs, so I'm interested in giving my planet such conditions. I'm mainly interested ...
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What kind of climates and biomes would exist on the continents a tidally locked ocean world?

Please note: I am asking about planet orbiting a star, not a moon orbiting a planet. So I’ve been trying to get this planet down for a long while now but there are still so many pieces of the puzzle ...
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How can early people prove that their planet is a cuboid?

Imagine a cuboid planet with a thick atmosphere orbiting a star similar to our Sun. The inhabitants are as intelligent as humans and recently discovered the universal laws of gravitation and motion ...
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Colonies on Jupiter

I'm making a series where a multi-purpose frigate travels to Jupiter in order to help in the Mars versus Jupiter war. However, I don't know what the colonies would look like. Maybe floating with ...
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What are some ways to hide a planet?

A major plot point for my story is the Protagonist stumbling upon a planet that was purposely hidden from the rest of the galaxy (at the edge of the galaxy) as it's being used by high level government ...
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1answer
103 views

Planet with only plant-based life and very thick atmosphere [closed]

Working hypothesis is as follows: Solar system with an A class sun. Planet has a very thick atmosphere which does not allow much visible light in to the surface. (Like dusk in the day time and ...
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3answers
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How would normal colors be affected if a planet's atmosphere was green?

Good day everyone. I've recently finally gotten around to writing a sci fi novel but need help on some of the science of a few concepts I would like to incorporate in the novel. I'll start with the ...
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Are Geologically Dead Planets Habitable?

One of the planets I'm thinking of for my book series has all of its landmass in the northernmost half of the northern hemisphere (it is thus mostly a water world) and is completely geologically dead. ...
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3answers
200 views

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 ...

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