Questions tagged [planets]

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

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6
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1answer
122 views

Oceans of breathable liquid

I want to create a locale (hopefully a whole planet?), where the ocean is breathable. I was looking at perfluorocarbons, so the liquid part is at least possible(?) Is there any way to create a world ...
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3answers
673 views

Plausibility of an atmosphere on the furthermost planet of a solar system

Atmospheres like Earth's or Mars would freeze and precipitate towards the surface if the planets were to be moved very far away from the Sun, since the light that reaches that far is incredibly dim ...
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Can a planet move itself?

Most questions in this vein seem to center around the inhabitants of a planet moving it. I have a significantly different spin on this idea, though. So, you're a big ball of rock spinning around a ...
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1answer
65 views

Scanning for Resources and Mapping a Rogue Planet

EDIT: Thanks to Starfish Prime's answer to this it looks like the atmospheric ice would only be ~16m thick, and the water vapor is a rounding error. I have adjusted the layering to account for their ...
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3answers
125 views

Why would humans fight a planet full of monsters? [closed]

So in my world a portal suddenly opened on a field. The portal leads to a planet full of monsters. Why would the people in my world attack and defeat the evil planet. What resources would there have ...
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3answers
732 views

What is the largest possible appearance of a celestial body in the sky?

In SciFi Art we often see planets/moons/stars fill enormous amounts of the visible sky. I'm wondering what the theoretical limit for this is realistically, since there are maxima for the possible size ...
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3answers
706 views

What could be the largest geosynchronous moon?

If we consider a planet with the same characteristics as the earth, (diameter, mass, rotation period) what would be the maximum possible diameter of a moon on a geosynchronous orbit? Considering the ...
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1answer
91 views

What color would plants be on a hot spring planet? [duplicate]

I had an idea for an alien world I want to set a story on and if this question proves popular I might ask other questions regarding this world. The world in question is an earth like moon orbiting a ...
2
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1answer
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Rocheworlds mass

Suppose you've got two tidally-locked planets, each one orbiting its own red dwarf. With two red dwarfs to hold the planets, could the planets get close enough to share atmospheres? And how would you ...
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5answers
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Could We See a Lagrange Giant in the Sky?

The "Lagrange giant" in the title refers to a gas giant that orbits its star in the same distance as Earth does. The alternative description is "Trojan planet" or, to be most ...
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3answers
184 views

Low gravity planet, giant creatures?

I want to create a planet that has: Low gravity. Giant creatures (not quite Godzilla sized, but bigger than Dinosaurs). Human explorers should be able to jump incredibly high there, maybe even fly/...
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3answers
671 views

Could a Titan-like moon orbit a terrestrial planet?

Could a terrestrial planet (1x diameter and mass up to 1.5x diameter and mass) hold a Titan-like (dense atmosphere, relatively large size, weather) realistically in its orbit? If not, how large would ...
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1answer
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What Kinds of Gas Giants Would Work Best in Orbiting an Orange-Dwarf Binary?

The term "gas giant" is, surprisingly, not uniform. It turns out that there are far more to the gas giants than Jovian or Saturnian. I won't list you all of them, just those that I find ...
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5answers
244 views

Binary planets system day/night cycle

My story has two planets separated by ~35,000 miles of empty space- tidally locked through a magic "planetary anchor" light rope that connects the two planets and keeps them at that exact ...
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2answers
198 views

Influence of an inner gas giant over a solar system

I'm designing a solar system with three planets in its hot zone, two in its cold zone and three in its habitable zone. All of the planets are rocky worlds of various sizes, except for the middle world ...
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19answers
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How Do I Keep the Population of an Ecumenopolis Reasonable?

In the galaxy I'm worldbuilding for my science-fantasy series, by far the most important planet in the galaxy is an ecumenopolis called Ishga. What I had in mind for this planet is something ...
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3answers
178 views

What if a moon orbits far away and extremely fast?

Imagine an Earth-massed moon orbiting around a Saturn-massed planet in a period of 28 days. This calculation tells me that is possible if the moon is 1.8 million km away. If so, the moon must be ...
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6answers
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How Big Can a Habitable Planet Get Before Its Gravity is More Than 0.8 m/s² above Earth's 9.81 m/s²?

This is NOT a repeat of this question. I am NOT looking to see the smallest planet possible that has less gravity than Earth. I am looking for how big a perfectly habitable planet (Habitable meaning ...
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1answer
172 views

Acute Radiation Poisoning on Io

I am trying to develop story about the colonization of Jupiter's moons. Io is assumed to have a background radiation of roughly 3600 dayrems. I would guess that other factors such as lunar ...
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2answers
184 views

What would be the climate patterns on a lush life-bearing moon orbiting a gas giant in the goldilocks zone?

The moon would be similar to Earth in size and composition and the gas giant comparable to neptune or uranus. Will the periods of eclipse of the the giant have an effect on climate? What about the ...
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2answers
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Is this fictional habitable exoplanet of Alpha Centauri A realistic?

Based on the real Alpha Centauri system, I want a harsh but technically human habitable planet around Alpha Centauri A. This is for a hard science-fiction PC game. My question is: are these planetary ...
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3answers
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Can periodic gravitational tug and pull of binary star ensure that a planet stays extremely tectonically active?

There's a binary star system with a close pair of stars ( A1 V and G2 V), in which there's a rough analogue of our Mercury that orbits both of them - a planet that's supposed to be closest to the pair ...
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1answer
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What does it take to vaporize (Or possibly put a hole through) a planet? (G.R.B.C. Part 2/2) [closed]

Now, like, 40 minutes ago, I asked a question concerning a possible Gamma Ray Burst Cannon. And I was disappointed, to say the least, with the answers. So, it's time for Gamma Ray Burst Two: Electric ...
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11answers
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What would justify those road like structures

Working on a sci-fi project, similar to well known properties, in which real world road maps play a role, but need to justify them in world on a planet where people don't build on the surface. I have ...
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2answers
141 views

Ring of storms around a planet

I'm looking to see if it's possible to create a planet which has constant, violent storms occurring in a ring around the planet. There's been plenty of questions on here about weather on tidally ...
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Would it be Possible to Extract Helium in a World Without Fossil Fuels?

I understand that on Earth, we mainly get our helium from natural gas deposits, which traps helium atoms generated from radioactive decay. Would this process still work on a terrestrial planet without ...
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2answers
390 views

What would happen on the surface of a terrestrial planet captured by a gas giant?

So, from what I've read of Porter & Grundy (2011), most gas giant planets orbiting within their star's habitable zones are thought to have migrated there from further out in the solar system, with ...
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0answers
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Geology and climate etc on a earth size habitable moon of a gas giant [closed]

A bit of background: I'm in the beginning stages of creating a habitable moon orbiting a gas giant. The conditions I have so far for this are: The moon itself is more or less Earth-size, and the gas ...
6
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2answers
174 views

Is 50% CO2, 50% H2O ocean possible? If not possible, what other proportions are OK?

Can a planet have its whole surface covered with a 50% carbon dioxide and 50% water ocean (the substances being diluted in each other)?
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1answer
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Would an asteroid colliding with a terrestrial planet result in the creation of extensive caves nearby the crater?

I just did some research on the Chicxulub crater in the Yucatán Peninsula in Mexico, which is the crater from the asteroid responsible for the extinction of the dinosaurs. Yucatán itself does have ...
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2answers
189 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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1answer
208 views

Can a fast planetary rotation create a planet with an equatorial continent, preferably with very high mountains and two polar oceans?

I’m trying to create a planet with two small polar oceans with equatorial supercontinent in the middle. The land is in turn divided in two by high mountains that act as barrier and a source of water ...
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1answer
125 views

How can a planet have relatively common lethal hailstones?

Sometimes hailstones reach sizes that are deadly to large animals and people and livestock have been killed. This is a relatively rare occurrence on Earth of course. If I want a planet where lethal ...
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4answers
250 views

Can a super-Earth of Approximately 1.5 Earth-Radius and 3.0 Earth-Mass Be Habitable?

Can a super-Earth of approximately 1.5 Earth-radius and 3.0 Earth-mass be habitable? By habitable, I mean terrestrial with liquid water on its surface, a rocky ocean floor, and no thick hydrogen/...
4
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3answers
225 views

What are reasonable densities for terrestrial planets?

Earth's density is about 5.51 g/cm^3 and it's the highest density in the Solar System of a terrestrial planet. I understand that planet density is partially determined by various factors, including ...
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2answers
220 views

Is my planet possible?

I imagined a hypothetical planet named after Bacchus (the Roman god of wine, ecstasy, parties, theatre, drama, comedy, tragedy, and spiritual madness). Its main characteristic is an ocean composed of ...
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1answer
98 views

Twin worlds governed by nitrogen

https://www.space.com/amp/we-dont-understand-exoplanet-habitable-zones In the link above is an article about how atmospheric nitrogen could affect habitability of a planet. Examples given are a wet ...
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2answers
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How to Cause a Hydrosphere Apocalypse Part II The Great Flood

This is part two of a two part question. You can find part one here.(How to Cause a Hydrosphere Apocalypse Part I The Great Drought) One of the more interesting movies I watched growing up was ...
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3answers
881 views

Mars sized planet with 83% Earth gravity?

For one of my stories I’ve developed a planet with approximately the same total surface area as Mars. This planet has high quantities of heavier metals/elements (especially silver) and it has roughly ...
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5answers
4k views

How big does a planet have to be to appear flat for human sized observer?

Alternatively what eye properties can be modified to give the feeling of living on a flat, but infinite plane rather than being on a really tiny planet? Edit (16 hours after posting): Thank you for ...
5
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3answers
147 views

How to Cause a Hydrosphere Apocalypse Part I The Great Drought

This is part one of a two part question. Part two can be found her (How to Cause a Hydrosphere Apocalypse Part II The Great Flood) Desert planets are a staple of science fiction. And while we have ...
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3answers
75 views

What physical conditions should be present on a planet for humanoid bird-creatures to exist? [closed]

I'm writing a fantasy novel with a sentient human-bird species. These creatures magically transform, growing feathers etc. becoming essentially giant birds. What would the general conditions on this ...
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2answers
145 views

How to calculate the greenhouse effect?

I tried many equations (Stefan-Boltzmann constant) that gave me a temperature of 249.769 Kelvin (-23.38°C) assuming no atmosphere and 297 Kelvin (24°C) with perfectly absorbing one, but my planet is ...
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1answer
86 views

Different Environment of Amoebic Sea

I want to work with my own amoebic sea like on Darwin iv in the mockumentary Alien Planet. But I wonder if it would be the same throughout. Would the parts near the poles be frozen? Would shallow ...
4
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1answer
93 views

How would different factors increase the speed of tectonic plate movement

The movement of the tectonic plates in the Earth's crust is quite a small amount, at only a few centimetres a year. How fast could the movements of a tectonic plate get up to if an earth-like planet: ...
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2answers
722 views

Could a planet's tidal forces break an asteroid passing very close to it?

I want a certain asteroid of my system to break into pieces as it approaches a planet, having one fragment impact the planet itself, another fragment slingshot and impact the planet's moon and the ...
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2answers
133 views

Is an atmosphere that it's not breathable but won't damage the skin on a tidally locked Ocean planet plausible? [closed]

In my story, people are trying to colonize an Ocean planet that orbit Ultra-cool red dwarf. (Based on this Wikipedia article a planet can retain Water in this type of stars with a mass around 0.08-0....
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5answers
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Can any manmade vessels float on ocean of liquid nitrogen?

Humanity is finally reaching the interstellar space and had discovered a terrestrial planet covered in liquid nitrogen, the planet is orbiting a star thrice as massive as Sun but is too further away ...
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4answers
230 views

What would an until-recently waterworld look like?

So, suppose a world that, for most of its biological history, was a water world, with minimal dry land. Starting from the Cambrian Explosion analogue, the world stays like this for roughly 460 million ...
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6answers
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How to remove Saturn’s rings?

So oblate spheroid man is mad. One of his oblate spheroids has these nasty rings on it and he cannot watch it rotate in peace. So he dispatches Mr. Skeeble to get rid of them. Mr. Skeeble gets to ...

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