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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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How to explain the presence of a dense debris field around Earth?

I'm creating a sci-fi world similar to ours roughly 50 years in the future. Unobtanium, a futuristic metal and fuel source, was discovered in 2020. Its broad utility led to rapid advances across all ...
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2answers
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How would a colossal explosion affect an ocean-based planet?

In my book series, a space station called the T-Ray that is capable of causing explosions the size of the Chixculub impact explosion just fired at a planet that is completely covered by a massive ...
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2answers
92 views

Could the TRAPPIST-1 planets have moons?

The TRAPPIST-1 planets are all very close to each other and thus are subjected to strong gravitational forces amongst each other and to the red dwarf they're orbiting. Would it be possible for them to ...
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1answer
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How does the n-body-problem affect a star system around a red dwarf?

So my story is set in the TRAPPIST-1-system and a rogue planet enters the system. When it's still far off, a scientist discovers that one of the numbers is slightly off. (She has some tables that ...
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3answers
984 views

How Would A Group of Undersea Explorers Survive if Their Food Supply Ran Out?

In my book series, a group of a few hundred explorers are sent from a planet called Ishgabangaloodoo to explore Sea World. Some things to know about Ishgabangaloodoo: Its citizens are referred to as ...
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8answers
243 views

Calendar dates on different planets

I have about five main planets in my fictional universe and like any planet, their days, months, and years are all different. Are there any problems that could mess the narrative up, since my ...
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0answers
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Artificial Intelligent Robots are taking control of my planet. How to stop them? [closed]

My Planet is actually 100 years in future when compared to earth's age. It got all kinds of resources and technologies when compared to an earth like planet(Even more advanced like flying cars and . ...
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4answers
204 views

Aside from low gravity, what conditions favor dramatic terrain?

Fantasy and sci-fi works often are set in worlds of dramatic terrain, because, well... it's dramatic. A few examples of the kind of thing I'm talking about: I understand that Earth has some ...
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3answers
219 views

What would be the human physiological reaction to an alien biosphere?

This is the first question about colonizing an alien world; the second question on agriculture on this planet is here. So here's the idea: human beings travel to and land on an Earth-like world with ...
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1answer
95 views

Earth Exploded, Orbiting and double moons

I have a scenario which I am too poorly knowledgeable to address, I'm hoping for some expert input. I'm currently writing a novel, in which a large section of Russia/EU continents were blown up in a ...
8
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3answers
258 views

What is the maximum orbital time for my moon around my planet?

I fear the math involved is beyond my capabilities on this one. I have what I consider to be more than a Layman's understanding of the physics involved, and I believe I can follow the math well ...
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1answer
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Could organisms live in the rings in a planet?

Think of Saturn. In this book, some people travel to a gas giant with rings and find an ecosystem in the rings of a planet. It has predators and prey. It has plants and animals. Autotrophs and ...
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4answers
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How can aliens from a different planet move faster when they're on Earth?

What should conditions on an alien planet be like, if the aliens of said planet move 3 or 4 times slower on their home planet than they could if they were to come to Earth? (Gravity, atmosphere, etc.) ...
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1answer
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Would an Earth-like planet have similar weather phenomena as Earth

I'm designing an alien planet which is roughly similar to earth (continents, oceans, breathable atmosphere, plant and animal life on it), but i was wondering: Could a planet that is very similar to ...
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6answers
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Can a collision with a neutron star make a planet via the can-o-snakes method?

Simplistically, a neutron star is a celestial body with enormous mass crushed into a small volume. That crushing force is gravity and the result, one might think, is atoms packed much more closely ...
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3answers
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Are there any plausible 'alternative' methods of planetary formation?

The selected answer on this question provides an extremely good, and detailed, description of what is generally accepted to be the main (only?) way a terrestrial planet can form, i.e. through ...
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2answers
191 views

Is it possible for an atmosphere to have gasoline mixed in it?

Is there such a thing as gasoline vapors, or some kind of gas that can be given off by gasoline? I'm trying to come up with a planet where the atmosphere is combustible and constantly catching on fire ...
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3answers
379 views

Is there software to help me model tides?

I have a planet orbiting a roughly Sun-like star, accompanied by a moon that's a bit more massive than our own Moon. The surface is about two-thirds water and one-third land, with most of the land in ...
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1answer
81 views

Two planets with the same orbital period [duplicate]

I have the following star system configuration: All bodies always stay on one line. Star is similar to sun by parameters. "Green" planet is Earth-like exoplanet with 1 earth-year orbital period, ...
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1answer
227 views

Any potential problems with the density of a planet with a volume 8 times that of Earth but the same surface gravity as Earth?

Assuming that there is an Earth-like planet that has 8 times the volume, 2.83 times the radius, and has the same surface gravity as Earth, and has oceans; what are potential problems concerning the ...
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1answer
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The Great Carina Nebula in viewing range of a planet

How close should a planet be to the Great Carina Nebula for it's inhabitants to look up and see this in the night sky? I'm aware much of the sharpness of the view would be lost due to the atmosphere, ...
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3answers
156 views

Is this planetary moon's calendar possible?

I'm attempting to create a world that has very brutal, hard swinging weather and environments, leaving much of the planet desert-like. The world I've designed is a moon of a gas giant. The Parent ...
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1answer
137 views

Nebula View from the surface of a planet

I'm aware this question has been been answered in some detail and form, but I'd like to know this. How spectacular would a nebula look like from the surface of, let's say, a Super-earth like planet? ...
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1answer
209 views

Given the mass and composition of a planet, can one determine what the radius should be?

I'm trying to auto-generate random solar systems, and I'm basically just allocating 2% of the total system mass to planets (and moons). It provides interesting results, I always have a few gas giants, ...
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1answer
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How do I figure out the size of an Earth-like world's layers and composition of elements

After getting help from the members of this site with Worldbuilding an Earth-like world around an F-Type Star, I have another question. The Planet's radius is 90% of Earth's. The Planet's rotation is ...
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2answers
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A meteorite is about to ram into a planet. How long do the main characters have to leave the planet before they die?

At the end of Book 6 of my book series, a magic ritual has caused a large meteorite (around 1/4 the size of the one that caused the chicxulub crater) to ram into the small planet (around the size of ...
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2answers
209 views

What geological consequences would result from a binary planet system?

Before picking specs, I need to ensure feasibility. Only one of the planets need be Earth-like; in fact, I would prefer if the other planet were rather small and dead, like a moon. The orbits will be ...
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2answers
205 views

What are reasonable rotation rates of an Earth-like world?

I have the radius, volume, mass and density figured out. It does not have a moon. I do wonder how that will affect the rotation. The Earth's rotation was considerably faster before the creation of the ...
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1answer
390 views

What would tides look like on a planet with two similarly sized and oppositely places moons?

I’m making a mostly ice planet with two moons. For the purposes of this question, let’s assume that they are both proportional size and distance to the size and distance to our moon. Both are tidally ...
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1answer
105 views

How can the Progenitors oxygenate a world?

The Progenitors are an ancient race of almost infinite technological sophisitication, who mysteriously vanished millions of years ago for no good reason (I don't like TV Tropes, but you are welcome to ...
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3answers
316 views

Can Mercury's orbit be explained without relativity?

The orbit of mercury is different than rest of the planets. The reason for this seemed unaccounted for in Newtonian physics, and was later explained by Einstein's theory of relativity. Here is a ...
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3answers
262 views

What is the most powerful magnetic field a planet could generate?

What is the most powerful magnetic field that could be generated by a planetary object? The measurement of 'powerful' will be field strength ($\mathbf{B}$-field) at the planet's surface, in teslas. ...
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1answer
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Effects of Hot Jupiters on habitable planets

Essentially, I'm designing a solar system for form of alien life. For the sake of ease, the star is roughly similar to the Sun, and the habitable planet follows an orbit anywhere between Earth and ...
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4answers
255 views

Is it possible for a naturally occuring star system to have 120 planets?

In my book series (link here), there is a star system at the northern edge of the galaxy called the Ryu system. I am planning for this star system to be huge, encompassing 120 planets. The vast ...
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5answers
178 views

A planetary region with no night and no tidal locking?

Without tidal locking, would it be possible to have a planet with a region roughly the shape and size of the USA and Canada in which it is always "day"? (By day I mean at least as bright as a clear ...
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2answers
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Earth-like planet which is smaller but has the same gravity

If there were a planet similar to earth where the lines of latitude and longitude were half as far apart (about 35 miles instead of about 70), but the planet's density were increased to compensate for ...
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1answer
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Would this simplex ternary system be stable?

I'm trying to make a trinary star system but I'm not sure how it would work. The primary star is an M0Ve star (red dwarf flare star). The orbits of the other two stars are slightly more complicated. ...
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11answers
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How can a portal that connects two planets affect the environment?

In my world there are two planets within the same solar system, which are connected approximately every seven cycles through a portal that opens for a few days. The planets are very similar. The ...
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13answers
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An Eden-like moon orbits a barren terrestrial planet. Why is the planet barren while its moon is earthlike?

Obize is an Eden-like moon orbiting the barren terrestrial planet Akaria. This planetary system is special in the fact that the two worlds are complete contrasts to each other. The moon has plentiful ...
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3answers
115 views

Half gas half rocky planet

I am envisioning a very big planet that at the equator Is mostly composed of gases. Further away from the equator a crusts forms of matter - rocks that then also contains an ocean. I am still ...
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3answers
176 views

Largest artificial planet

How large could a solid planet be (in theory) without becoming a star or black hole? Too much in the way of light elements would lead to thermonuclear ignition, but too many heavy elements would ...
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0answers
57 views

How big could a planet be and still have earth like conditions? [duplicate]

I am building a world that I would like to be as big as possible and still have very close to earth like conditions, gravity, weather, seasons, life and other things that are similar. Would things ...
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13answers
3k views

Possibility of using large asteroid as planetary attack weapon

I am writing a story where the human race is divided into two groups one called Martians (they left to live on Mars) and the other Earthlings (who stayed on Earth). The Martians want to destroy Earth ...
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1answer
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Is it possible to have a near tidally locked planet?

I'm working on a story where the characters are stranded on a planet that turns so incredibly slow that it acts like a tidally locked planet, with one side burning and the other frozen. However ...
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3answers
135 views

Geology on low density planets

I am currently working on a piece that has a planet (about double the size of Earth). It is worth noting that this is a low density planet. Without any other factors (Earth-like atmosphere, same ...
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7answers
4k views

What would it take for an island to sink and rise yearly and naturally

So I'm writing a book and need help to better explain this island that sinks, more on that in a moment as I give you the basic build of the planet... First, its a world on a very tilted angle. the ...
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2answers
99 views

What kind of climate would a planet with a 49-day orbit have?

I'm using Kapteyn-b for a story, which orbits its red dwarf star every 49 days. It's almost 5 times larger than Earth, though I've made a couple changes to the observed data to make it more plausible. ...
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2answers
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What is a usable formula for determining the necessary strength of a planet’s magnetic field for it to be habitable?

To my understanding, part of the reason life is able to exist on Earth besides its ozone layer is due to its magnetic field, which protects the planet and its life against solar winds and keeps the ...
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1answer
113 views

How do I calculate the amount of sunlight a planet gets?

I'm working on a planet and I want to know what is the maximum amount of sunlight my planet gets in lux (for Earth It's 120000 lux). My planet orbits an M4V class red dwarf that has a mass of 0.22 M☉...
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19answers
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A magician can draw magical power from other planets in a star system, but not their own - why?

Basically, in the world I am building, magic-users draw the energy necessary to use their abilities from other Realms - specifically, these other Realms are actually planets in the solar system. This ...