Questions tagged [planets]

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

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1answer
65 views

Would gravity be stronger or weaker on different sides of a dual planet?

If you had two similar sized planets that were tidally locked to each other, would gravity change depending on whether you were closer to the sister-world? Assuming they were quite close.
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Double planet climate

How far would 2 tidally-locked (to eachother) planets need to be from their blue star host to be habitable, but have a cold-weather climate similar to our Ice Age?
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How big of a problem would UV radiation be for colonists around a main sequence blue star?

I've settled on using a blue star for my setting. It'll probably either be a small B or large A-type main sequence star, somewhere between 2 and 4 solar masses. There is one relevant planet. I've ...
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1answer
44 views

Plausibility of Low-Pressure Breathable Atmospheres?

My question is inspired by the fact that in the computer game Elite:Dangerous, the player's spacecraft is capable of landing on planets with "tenuous" atmospheres, measured as being 0.1 ...
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Central planet in binary star system?

https://en.wikipedia.org/wiki/Habitability_of_binary_star_systems The wikipedia article describes P-type and S-type orbits for planets in binary star systems. There are possibly some other ...
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3answers
153 views

What would you need to have a planet orbiting two binary stars

I am writing a story and the world it takes place on orbits a binary star system. Two stars, one a yellow dwarf like our sun, and the other a small, dimmer star. It takes the planet about twenty ...
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2answers
101 views

What could cause the land masses of earth to move freely around?

In the story I'm making that takes place on an alternate reality of earth in the 1300s, there is an all powerful being that makes all humans immortal. later on he gets angry that not everybody is ...
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1answer
94 views

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 ...
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6answers
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Could an Irregular Orbit Cause Significantly Longer Seasons?

I have a fantasy world I'm making, with a planet and sun similar to our world, except the length of the seasons are significantly longer. Each of the seasons last two years, and the full seasonal ...
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4answers
137 views

What atmospheric conditions would be needed produce intense heat, weather and wind that could fry a human in less than 5 minutes at sea-level? [closed]

first time poster here. The premise: I’m trying to design a planet in where sea-level / lowlands are an uninhabitable wasteland with temperatures that would fry a human in less than 5 minutes. In my ...
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2answers
165 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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1answer
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Hycean world life questions

https://www.space.com/amp/new-class-habitable-exoplanets-hycean-worlds Hycean worlds are planets 2.5 the size of Earth with huge oceans and lots of hydrogen in their atmosphere. They're probably ...
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How big can a (human) habitable planet be while having around x0.7 the surface gravity of earth?

I've been working on the world-building for my setting and I realized I haven't really thought about the implications the lowered gravity I'm working with would have on the size of the planet. ...
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1answer
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Which part of the planets would suffer more meteoric impacts in a doble, tidally locked planet?

Picture a double planetary system, in which two bodies of approximately 0,5 and 0,7 times the mass of Earth orbit a common barycenter. Both bodies are also tidally locked to one another. Neither of ...
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Would it be feasible to make a planet out of asteroids?

Would it be feasible to make a planet out of asteroids taken from the solar system? It can only be made from objects less than 3 kilometers in radius inside the solar system. The way i'm thinking of ...
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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?
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Can an hourglass shaped planet exist, with core in the middle (small but dense) and crust at two other ends

Followup question would be whether life could exist in the surface area of the progressively smaller circles some distance away from the core.
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1answer
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What would the climate and ecosystems be like if instead of water, land would be 71% of Earth's surface?

According to the Bureau of Reclamation, water covers about 71% of the Earth's surface. Everything from microbes in the ocean releasing greenhouse gases into the air, to the immense amount of water ...
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1answer
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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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Is this habitable moon formation scenario plausible?

My and my teams' works take place on a moon orbiting as giant about 3 times the mass of jupiter (possessing also a massive moon system) in a solar system with an F-star and be either the first, third ...
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Traits of an intelligent & civilized species that lives under a red dwarf star?

More details -- their planet is very bigger than Earth, has stronger gravity than Earth's, it has 2 moons, it's not tidally locked, and they're supposed to have evolved from social obligate carnivore ...
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1answer
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Does anyone know how I can convert the time of my conworld into earth hours/days and vice versa? Is there a converter or formula I could use? [closed]

I try to find out how long the years/days/hours in my conworld would be compared to those of Earth. So here is some information about the conworld's time measures: 100 (earth)seconds = 1 (conworld)...
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1answer
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Desert-Adapted Humans: Differences between Normal Human and one Highly Adapted for a Desert

I am writing a story about a scenario where about 12,000 Americans are dropped onto an alien planet, specifically in a desert region of the aforementioned planet. Because of handwavium, they all ...
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1answer
149 views

Habitability of my world

For a big narrative project of mine I and my team developed an habitable moon that revolves around a gas giant in a star system with an F-star. I wanted to know what you think about it and if you ...
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1answer
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How plausible is this planetary system with binary stars?

In my world, I have a binary S-type Solar System of Star-A and Star-B with these properties: Star-A: Luminosity: 0.86822 Sol / Mass: 0.98097 Sol / Radius: 0.91958 Sol / Radius of Hill Sphere: ~37.218 ...
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I heard that Ocean is needed for tectonic plates, so how could an Ocean-less World maintain tectonic plates?

I heard that Ocean is needed for tectonic plates, so how could an Ocean-less World maintain tectonic plates? since I don't want to end up with a Venus-like atmosphere. If not plasuable what type of ...
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4answers
631 views

Is it possible to create ice on a planets equator using planetary rings?

I was looking into creating a planet with an icy ring around the equator while also having ice at the poles and bands of warm/tropical areas in between. The way I thought to do this would be having ...
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1answer
70 views

Surface features of a very magnetic/volcanic planet

In my story, a planet has About 1.5x to 2x the surface gravity of Earth Much more volcanic activity than Earth An extremely strong magnetic field (ideally at least 100x that of Earth. My research on ...
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2answers
244 views

Is there a mathematical way to calculate the density, volume, etc of a planet just using mass as data?

while I was working on the language I was thinking about the planet and I don't have the mathematical data, I have a fairly done map but not the data and it would be interesting to add it. As data I ...
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220 views

What would be the best material and structure for LEGO bricks to built planet-sized statues of local planetary system leaders?

In an interstellar competition the best LEGO world builders have gathered in all galaxies. They are the best builders that have emerged from inter-planetary competitions throughout the universe. Every ...
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2answers
180 views

Would life be possible on a planet with an eternal day and night? [duplicate]

The story I want to tell is about a world where one side of the planet always is sunlittenand the other side is always drenched in blank. The planet once stopped rotating (tangential meeting with a ...
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What would cause a moon to become much brighter only a few times a year?

I initially wanted to create a culture that used tides to tell the seasons, I'm sure I still can, but a question on here (I can no longer find it) made me wonder if I could set up a world where one of ...
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If the Earth is completely covered by mirrors, how quickly does it freeze?

Suppose all areas of the Earth is suddenly covered in indestructible mirrors (assume they reflect 70% of solar energy that would hit the land/ocean), how quickly will the increase in albedo cause the ...
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1answer
63 views

Calculating the Atmospheric Properties of an Exoplanet

I am developing a double-star system filled with several planets, a few of which will be habitable. I also have a spreadsheet file full of all the planets information, from Semi-Major Axis, orbital ...
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1answer
165 views

Planetary tilting bad?

https://phys.org/news/2021-07-goldilocks-planets-tilt-complex-life.amp This article says (rather poorly) that only a relatively small axial tilt of a planet like with the Earth could be beneficial to ...
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546 views

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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1answer
198 views

Would evolution come to a standstill on an ancient planet with (near-)zero radiation?

(Note: changed the question title, changed the expedition paragraph to mention weather stability (thx Christopher), voted to reopen, removed additional question section 20-jul) (Note: some finds ...
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Is it possible for the soil of a desertic exoplanet to be so copper rich that its surface is mostly covered in green-blue deserts?

Here on Earth, Mars and most of others if not all terrestrial planets in the universe, iron is their most common metallic element because iron is in general the most common metal in the universe. Here ...
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1answer
241 views

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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1answer
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Trying to survive a passing neutron star by burrowing deep in the planet's crust?

Situation: My colony is threatened by a passing neutron star. It turns out this planet is part of a binary system and once every several hundred years it passes by a neutron star, which irradiates its ...
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Why would humans build / send sample humanoid robots on an alien planet before humans arriving themselves?

Humans can send rovers and machines on other planets to navigate or to establish bases before human occupation begins. These rovers and machines are non-humanoid and suited to their mission roles. ...
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1answer
118 views

How Habitable are these Planets?

For the book I'm writing for my world, Damarian, the villains of the series (The NUSA, America's descendant) are banished off Damarian (Spoilers). The banished are shipped off, but 3 groups formed, ...
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8answers
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What would be the appearance and color of a deep, pure and vast liquid CO₂ ocean as viewed from space (ignoring the atmosphere's influence)?

So far I had no luck trying to find the visible absorption spectrum of CO₂ anywhere, all I get is the far infrared absorption spectrum and stuff like that. If you just search "what color is ...
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1answer
64 views

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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2answers
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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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3answers
168 views

Is it possible in the real universe for a planet to develop a thick Octaoxygen atmosphere?

I know how weird this question sounds and how the answer to it is probably NO at first glance, but I don't know enough about octaoxygen and oxygen to be 100% sure about the answer being NO and ...
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1answer
129 views

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&...
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2answers
107 views

How advanced would a civilisation need to be to notice one of their system's planets is tidally locked?

Picture a tidally locked planet that is also the closest planet to the star (~0,17 AU from a star with a luminosity of ~1,5 times that of the Sun). The side of the planet that faces the star would ...
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7answers
683 views

Can two empires jointly administer a region?

In my book series, there is a group of people on the Planet Awal called the Tifinagh that are the source of quite a bit of tension between the Haxamanians (the dominant empire on Awal) and the Aureans ...
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Can a planet harboring complex life be radioactively hostile towards Humans?

I am writing a story that involves the colonization of an exoplanet with very similar properties to Earth. This exoplanet would be orbiting a red dwarf, but due to certain factors (it's atmosphere and ...

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