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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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Mitigation of dust upkick in Martian terraforming? [closed]

For my fictional universe I want to terraform Mars, which involves raising the atmospheric pressure to 20kPa of oxygen. Now I realize that an atmosphere of that pressure is going to generate much more ...
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8answers
350 views

How can I make the Solar System uninhabitable?

For the Universe I'm creating Humanity has devolved into groups of scattered tribes. This is due to the fact we ran afoul of a really nasty alien race, who decided to leave us homeless. A coalition of ...
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2answers
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What animals would be most suited to a tidally-locked world? [closed]

Are there any species that would be able to sustain themselves on the sunlit face of the planet, the habitable Terminator-zone or even the freezing icy side of the planet? How would animals adapt to ...
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2answers
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What would the consequences be of a high number of solar systems being within close proximity to one another?

What would the consequences be of a high number of solar systems being within close proximity to one another? I'm mainly interested in the consequences for life on multiple planets. When I say 'close ...
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2answers
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How long would this eclipse last?

For a moon orbiting a gas giant which is in turn orbiting a star, I want to know how long the eclipse would last for an observer standing on the moon when the planet passes between the moon and the ...
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3answers
235 views

How to calculate the loss of primordial heat for a given age and mass of a planet?

I´m working on a computer program which generates realistic planets for worldbuilding purposes. I´ve run into an issue with calculating my planets heat loss. While radiogenic and tidal heat generation ...
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5answers
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1answer
292 views

How would our skies look if our sun was a white dwarf instead?

What I'm using your information for: My planet is small, has a thicker atmosphere than earth and it's orbiting a white dwarf. The main reason I chose it to be a white dwarf is that I read somewhere ...
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2answers
215 views

At What Point Does a World's Twin Planet Disappear, from the Viewer's Perspective?

This is Yeola~Camay. A double planet orbiting Sharro, an ordinaryish star somewhere in the universe of Far Far Away. As you can plainly see, Yeola is the planet on the left & Camay is the planet ...
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4answers
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Asteroid in the asteroid belt suddenly gains the gravity of the earth

An entrepreneur has a dream. He wants to create the most amazing and magical amusement park in the solar system. He goes to investors with the blue prints of the park, and they think it's a good idea, ...
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4answers
173 views

Rotation period of a planet around a star (sun)

Is it possible for a planet to be much further away from its star than earth is from the sun (because for example the star is much brighter/Hotter) yet still have a comparable (as in not tens if not ...
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4answers
142 views

Is it possible to create a realistic habitable planet/moon with actually alien landscape? [closed]

There is a standard challenge while creating landscape for habitable planet, as it should be both: physically realistic (so presumably like Earth) alien (so presumably not like Earth) Standard, ...
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3answers
135 views

Rotation, weight and planet size

Wouldn't it be cool if giant monsters were on giant planets? Of course it would be, but unfortunately physics doesn't really like that idea. Big planets make things on them need more support, so being ...
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1answer
200 views

What would be the effects on a planet orbiting a shedding red giant?

In a sci-fi RPG I eventually intend to run for a couple of friends, I had the idea of them visiting ancient ruins on a planet orbiting a shedding red giant. Now, ignoring the problem of intelligent ...
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3answers
372 views

Can a large hemispherical planet be stable? [duplicate]

I had a vision of a planet twice the size of earth sliced in half like an apple by an invisible force, one half drifting away from the other into eternity. Unlike the planet Earth, it did no longer ...
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5answers
143 views

Is it possible to move planets to get them nearer to Earth? [closed]

Could we move rocky planets such as Mercury, Venus, and Mars to be closer to Earth's orbit? I know it sounds like a silly question and it's impossible right now, but if there is a small possibility, ...
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1answer
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Could a black hole be used to lessen surface gravity on a Super-Earth?

Due to the moon's gravitational pull, objects at Earth's surface directly under the moon are slightly lighter. This tiny lessening of gravity would also take effect if the moon were on the exact ...
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2answers
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Would advanced Plantoids be plausible? [closed]

Could it be plausible that if enough time given and favorable conditions are met, the dominant species of an alien planet could be a species of plant and by dominant I mean achieving sentience and ...
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1answer
106 views

How close would a planet need to be to its star to be dangerous but still habitable with thriving civilisations? [closed]

I'm creating an alien species and want to have them a bit too close to their star but of course, don't want to kill them. They're not very advanced technology wise but they have powers caused by ...
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1answer
70 views

How would humans evolve on this planet? [closed]

So I'm writing a story in which an advanced alien race, for reasons unknown, takes some humans from the Earth and leaves them on a far away habitable planet. Before droping them off, the aliens do ...
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2answers
325 views

How do I give my planet a stronger magnetic field? Playing with variables

Let's say I have a terrestrial planet superficially like earth, except that it rotates much slower (about 10-15 days per rotation) and its atmosphere is ideally several times thicker. If I want this ...
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3answers
2k views

Can a planet still function with a damaged moon?

I'm thinking of having a world that has a moon that's been partially split (so not fully halved) with the debris slowly separating from it. At night you'd see the split moon mainly and lots of ...
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2answers
244 views

Drawing landmasses for this odd-shaped planet

I've just come here for some help drawing a map for this fictional planet where two roughly similar planets have been smushed into kind of pear shape like this: So this planet spins on an axis which ...
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1answer
242 views
+100

Brown Dwarf Star vs Gas Giant as parent for habitable moon

I seek to build a habitable moon of a giant planet, thus I looked at the Rouche Limit Equation to figure out how to get the biggest possible Hill Sphere for my moon to exist in. $r_H = a(1-e)\sqrt[3]{...
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2answers
155 views

How to calculate rate of axial precession?

I want to start with the fact that I am by no means an astronomer, or even a hobbyist in the field. I am attempting to build a fantasy world which still reflects accepted physical laws. My problem ...
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1answer
158 views

What is the largest I can make my water planet, while remaining within Earth-like parameters?

What is the largest planet I can get, while still remaining within Earth-like parameters? My concern is with gravity, water pressure and atmospheric pressure. Escape velocity is less of a concern. ...
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Planet builder? [closed]

I've got questions I haven't been able to get a grip on for two different planets. One has its axis at about 90deg (like Uranus), with day & year like Venus (day longer than year), orbiting a ...
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4answers
178 views

How could a planet's magnetosphere fail?

I have a hypothetical world in the works and I have a rough idea of what it might be like. My idea is that the planet was life-supporting with a widely varied biosphere. The magnetosphere failed and ...
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8answers
4k views

How could a planet have most of its water in the atmosphere?

I am creating a speculative evolution project for school (and partially for leisure) and I need a planet for my organisms to live on. I have a rough idea of what it may be like but I'm no expert in ...
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1answer
112 views

Would life be possible on a planet that has an axis of rotation that always “pointed” directly at the sun? [duplicate]

Preface: I'll be calling call the orbit described in the question title a "solar-oriented orbit" for the sake of convenience, as "a planet that has an axis of rotation that always pointed directly at ...
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13answers
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A non-technological, repeating, phenomenon in the sky, holding its position in the sky for hours

Is this physically possible? A non-technological phenomenon visible in the same position of the sky, for 18 hours of a day using the other 6 to do whatever, rise and set, just be impossible to see, ...
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3answers
176 views

What would increasing the gravity of a moon do to its planet?

If I terraformed a moon to have enough artificial gravity/atmosphere to support life, would they end up just crashing into each other? Is there a way to not have this happen, e.g., increasing distance ...
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2answers
159 views

Atmosphere of habitable world around K-type star

I'm trying to work out the parameters of my planet, using the spreadsheets that Artifexian has developed (particularly this Planet Calculator and this Atmosphere Calculator) as a guide. In order for ...
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How large can a rocky planet be? [duplicate]

What is the maximum diameter and mass can a rock-based planet be before it collapsed to degenerate matter? If "rocky" isn't defined enough, assume basalt. "Degenerate" means the planet (or at least ...
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1answer
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Plausibility of “diamond”-like crystal and/or mineral substances forming on a planet orbiting a dwarf star

Alright, so the primary inspiration for this is 55 Cancri e, the speculated carbon "diamond world" and to a degree, Nkllon, a planet in Star Wars that is essentially what Cancri is, but "confirmed" to ...
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3answers
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Plausibility of purple oceans

Alright, so I've been meaning to write out a planet with golden/yellow fields and a violet / purple ocean. What I was thinking about is having the water of this world is so clean and nourishing that ...
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3answers
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Object in the orbit or orbiting Uranus's moon Puck

I realize the response to this question is fairly involved but here goes. I need to have an alien spacecraft either in orbit around Uranus's moon Puck or somewhere in Puck's orbit around the planet if ...
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4answers
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How to define operational altitude on other planets?

Since different planets have different gravity, atmospheric pressure, air density and composition, it's obvious that a definition of operational altitude based on earth sea level is inadequate for a ...
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3answers
1k views

Black holes as heat sinks

Cooling in space is a well known difficulty. There are many unpleasant consequences like no stealth in space, difficult space battles which turn into a short wars of attrition (because you have to ...
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2answers
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What phenomenon (gravitational?) in space would allow the transfer of humans rapidly between two planets or system-wide?

So what I'm looking for is some plausible idea of two human planets, orbiting each other closely, that despite having regressed to a medieval homage, were capable in this old era of powering solar ...
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3answers
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What thickness of atmosphere and strength of magnetosphere would I need for a planet to have a deadly daytime and a hospitable nighttime?

What thickness of atmosphere, and strength of magnetosphere, would I need for a planet to have a deadly daytime and a hospitable nighttime? I'm wanting a planet in which humans can survive on as long ...
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0answers
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Could a rogue planet support life? [duplicate]

I was wondering whether a free floating planet could potentially host life. If so, how? I was thinking of a geothermically active planet, where the only source of heat comes within the planet itself. ...
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2answers
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A pair of similar celestial bodies coming near each other

In my conworld I have two moons (they could be planets if desired as long as they can stay 'close' to a larger nearby body) of habitable size. I want to reality-check and provide an explanation for ...
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6answers
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Can a planet have a different gravitational pull depending on its location in orbit around its sun?

As the title say, can a planet have a different gravitational pull depending on its location in orbit around its sun? Is this explainable without magic?
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4answers
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What factors affect how many moons a planet can have?

A moon is just a natural satellite - something orbiting a planet - so I'm interested in what kind of factors influence how many moons a planet can have, and how many moons a planet will actually have. ...
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0answers
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How would an “minecraft-like” dimension behave? [closed]

The "dimension" I'm building, consists of earth-like plane that stretches on to infinity. It's a soft sci-fi universe and this dimension is man-made. The land has infinite mass, I don't know what ...
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4answers
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Would a high gravity rocky planet be guaranteed to have an atmosphere?

I want to create a planet with a deep gravity well, say about 12G at the surface. At first I wanted the planet to have either no atmosphere or a very thin one. But I want this to be as close to ...
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3answers
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Why would jupiter brain be completely devoid of ocean? [closed]

Jupiter brain is known as a colossal computer the size of a planet, if heat dissipation is a concern when constructing it how come most models lack an ocean of distilled reverse osmosis UV treated ...
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2answers
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Effects of a supermassive ship crash landing on a planet

My planet is a 20% larger than the earth, assume a similar atmosphere, but it can be changed to fit the narrative. My ship is not so large as in the original question, a cylinder shape, about a ...
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2answers
149 views

Designing a super-comfortable Earth analog

Being an engineer and someone who hates hot summers and frigid winters, and someone who really likes the Rocky Mountain view, I can not help but wonder if we humans could get to design a whole new ...