Questions tagged [planets]

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

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3
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0answers
62 views

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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18answers
4k views

How would Earth turn into debris drifting through space without everything at its surface being destroyed in the process?

Consider planet Earth in a distant future. Human technology has advanced, although it still respects the currently known laws of physics. I am trying to build a story where: An Event makes it so the ...
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6answers
3k views

Is it believable having a space industry constantly exporting resources from Earth to space colonies eventually leading to a conflict between the two?

This is for a video game project. In a future where living in the Earth's surface has become undesirable. People are building colonies in Earth's orbit. If materials from Earth are used to build ...
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1answer
157 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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1answer
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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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8answers
542 views

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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3answers
964 views

If our world was on a turtle… then how big would the planet the turtle is living on be?

This sounds really stupid, but I'm trying to think of a way to make World Turtle work. And what I got after 5 minutes of careful deliberation, would be that the our earth would have to be 'flat' on ...
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7answers
659 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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2answers
524 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
196 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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10answers
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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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NASA discovery: 1 star, 7 planets, multiple in habitable zone. How would this affect life on the planets?

I have left a link to the NASA video in case you are not to sure what I am referring to or to get a better picture of what I am talking about. https://www.youtube.com/watch?v=bnKFaAS30X8 With that ...
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1answer
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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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1answer
1k views

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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10answers
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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
94 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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21answers
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Why do people still live on earthlike planets?

Like our good SciFi prophet Isaac Arthur postulates, for a civilization with a decent space presence planets are overrated and rubbish. They're down there in the deep gravity well. There is no ...
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2answers
75 views

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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1answer
127 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&...
2
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1answer
62 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
406 views

Is it possible to have earth like planets in Jupiter lagrange points?

I'm writing a story in a system which has two earth like habitable planets orbiting the star in Lagrange points L4 & L5 of a gas giant similar to Jupiter / Saturn. Is that orbit possible in the ...
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3answers
155 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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2answers
165 views

How do you map the climates and biomes on a tidally locked planet with no Coriolis Effect?

I've been looking through some videos and reading up on mapping out climates and biomes for fictional worlds very similar to Earth (Artifexian's videos have been a huge help), but I have been curious ...
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The opposite to Worldbuilding: World Destruction

I am looking at different ways to destroy a planet. I am assuming the planet is of a similar size and composition to the Earth just to keep things simple. I am starting at boiling the atmosphere to ...
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4answers
494 views

How many people can my Spire world support?

Alright so I have this big colony ship/artificial world and I need to figure out what kind of population it can support. I’ll cut right to the chase and give you the details. Length: About 1,000,000 ...
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2answers
103 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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5answers
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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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2answers
124 views

What size/distance a planet should be from its star to have a dense atmosphere and not become a gas giant?

I have recently learned that should Earth form a tad farther from the Sun (at about the distance of Mars) it would have enough gravity pull to accrete hydrogen and not enough heat radiation received ...
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3answers
828 views

Seasons on a circumbinary planet

(I've tried to research this online but I'm a linguist, not a physicist, and most places that discuss this quickly get too technical for me. Simple answers will get tons of gratitude!) I imagine two ...
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5answers
286 views

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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4answers
148 views

Why is this planet such a bad place to live? [closed]

Admiral Edwin Witt was obsessed with discovering a habitable world so future generations would remember his name. After decades of searching, he found a world that challenges the very definition of ...
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2answers
158 views

Habitable low mass super earth and its habitable high mass moon feasability

So, I've got a fantasy world where there is a super-earth with Earth-like gravity (aim is approximately half-again the diameter of Earth) that is the homeworld of non-native humans(introduced to the ...
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2answers
13k views

How would winds behave on a tidally locked planet?

If an earth-sized planet were tidally locked to a star, and was in the life zone of its star with an earth-like atmosphere, what would its wind patterns be like? The planet would have one hot ...
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1answer
143 views

Alternate Biology/Xenoforming:Could the moon have a Chlorine atmosphere?

So I have this idea that a super advanced being travels across the galaxy and is terraforming/xenoforming every planet that CAN be modified for life, not just Carbon based Earthlike lifeforms but ...
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4answers
635 views

Is it possible to have a civilization in the core of a planet?

Or, technically, a civilization near the core of a planet. In this question I will describe some aspect of my design, and you may comment on the realism of these aspects and add improvements, or ...
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4answers
262 views

Would it be possible to have an earth-sized planet have much larger tides while remaining habitable?

I want a planet with roughly the same mass and volume of earth to have tides on a much larger scale than earth, enough that the coast would be extended for at least several hundred feet at low tide in ...
3
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1answer
97 views

Can a water world be turned into a dryer habitable planet by an early runaway greenhouse effect?

Consider an Earth clone with oceans several hundred kilometers deep, potentially deep enough to solidify into exotic ices. Such a planet would lose its initial hydrogen and helium atmosphere when the ...
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2answers
200 views

Maximum shell world planet size with earth-like conditions

I am trying to work out the theoretical limits on the size of a shell world (made with orbital rings constructed around a black hole). I have the following constraints: The light to the planet must ...
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2answers
368 views

Massive volcano on reef world?

Piggybacking on my previous question: Possible reef world? An answer in that question included that reef world is an "old, old world. (So)The core has frozen and plate tectonics have stopped...&...
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1answer
888 views

What would happen if the sun shrunk by 25% in 2000 years?

The big bad vilain is stealing energy from our sun. He has been doing this for 2000 years and the sun has already shrunk in mass by 25%. What are the effects on our earth. From what i found here and ...
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5answers
2k views

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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2answers
105 views

Appearance of an Ammonia World's Atmosphere

I started the process of making artwork for an Ammonia World and realized that despite all my previous research on their abiotic and biochemistry, there was one thing I never quite settled on; what ...
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1answer
115 views

Could a planet about 30% larger than earth but only 80% as dense still support a strong magnetosphere?

I've been trying to work out a few calculations for a planet I am working on and hit a bit of a roadblock. The planet in it's current state is 1.35x the size of Earth, but in order to get a density ...
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3answers
139 views

Could a “gentle” collision of a planet into another cause tidal locking and still support life later on? What other side effects could appear?

After a few years I seem to have come back to the topic of the possibility of tidal locking on a planet with life. I love speculative biology and designing these sorts of scenarios but tidal locking I'...
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5answers
197 views

Is there a way for a permanent Lunar eclipse, or another Object to always be in Earth's shadow?

I have a question regarding worldbuilding and haven't found a question like this yet, so I created an account and hope that someone can answer it :D As a starting point, imagine our real-life Sun, ...
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2answers
116 views

Would this planet be habitable for intelligent lifeforms

I am trying to make a universe using math and this is a planet from the first solar system I am making. Firstly the star. This star, which I don't have a name for, has a mass of 1.3 solar masses, a ...
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3answers
1k views

Life on a planet with multiple gas layers

Could a terrestrial planet have a stable set of layers of atmospheres, and could different lifeforms evolve within those different layers? This question is inspired by the diversity found on Earth. ...
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4answers
546 views

Usefulness of launching probes to verify the existence of a hypothesized planet

In a parallel universe, humans have a 95% confidence that Planet 9 exists with the parameters given on Wikipedia. However, they have not directly observed it and plan on launching many space probes to ...
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1answer
69 views

Alternative biology/Xenoforming 3:any ideas how to xenoform Mars? [closed]

So i have an idea of an super advanced being that travels around the galaxy and spreads life on every planet that has any potential for it.By "life"i do not mean only "Carbon based"...
3
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1answer
118 views

Damarian's Parameters: What are they?

For Damarian, I have its system starting to be worked out, and I even have the basics of Checuti and how Damarian orbits around its mother planet. (Link to my first question about this system is ...

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