Questions tagged [planets]

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

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31
votes
20answers
5k views

My planet has a long period orbit. How can I make the seasons change faster in order to shorten the length of a calendar year on it?

I wanted a habitable planet around a binary star system, so I conjured up a system that let me have one. The problem that I'm facing is that the goldilocks orbital parameters for this planed ended up ...
4
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1answer
78 views

Tidally Locked Planet with no Oceans

Picture an earth-mass, breathable atmosphere planet; tidally locked to a red dwarf; orbiting far enough out that the dayside is not scorching; and with no planet-wide liquid oceans (but probably local ...
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0answers
6 views

Photon trajectories affected by gravity [migrated]

If the gravity of a star can change the trajectory of a photon, is the speed of the photon reduced at the moment of departure from the stellar's surface? Can modern science calculate the measure of ...
6
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4answers
348 views

What would be the consequences of an Earthlike Planet retaining helium in its atmosphere

So I did the numbers using atomic rocket's page on worldbuilding and it appears my super-earth would retain the helium gas in its atmosphere from its early formation. What effects would this have on ...
10
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2answers
2k views

What would seasons and daylight be like if the Earth was on an eight-shaped orbit between two stars?

I'm building a medieval-high-fantasy world and I want it to have two suns. I'd like it to make it somewhat realistic at least as far as seasons and light/biomes go, while the actual feasibility of ...
4
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2answers
75 views

How could a planet with a long day-night cycle naturally regulate its temperatures to allow life?

So, my planet has (around) an Earth year long day-night cycle. How could its temperatures not reach extremes that would disallow life? Assume that everything is Earth like except for multiple moons (...
3
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2answers
471 views

Temperatures of a planet with 1,000 Earth day long day-night cycle

My planet is Earth like in size (I can change it, if needed), however its day-night cycle is somewhere around 1,000 Earth days long. How hot would day get, and how cold would night get? Is it possible ...
5
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2answers
398 views

How much of the solar system would be damaged if the earth was destroyed by lightspeed ship collision?

If a large spaceship travelling at near-lightspeed hit the earth and destroyed it, how far into the system would the devastation travel? Would colonies on Mars and Venus (and perhaps ships in orbit ...
5
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2answers
101 views

What is the smallest a planet can be whilst retaining a Venus-like atmosphere?

I am designing a science fiction world that involves the speculative evolution of large flying bat-like organisms with intelligence who are blind as their planet has an atmosphere like Venus, or at ...
13
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17answers
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 ...
4
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1answer
99 views

Is it possible to make a solar system based on an existing solar system

I've been making a solar system for my story based off the Keplar-47 solar system as my story has 2 suns like this solar system and since its easier to write a system based off a real one then to ...
8
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4answers
626 views

What is the minimum Radius required for an O'Neil or McKendree Cylinder?

This is a follow up to this question. Dimensions of an O'Neill cylinder with gravity and coriolis force like surface of Earth I read different things like football field length, 200km or 4000km.
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4answers
125 views

Would it be possible for a planet to have a northern or southern sunrise/sunset [closed]

I was curious, if it would be possible for planet in any star system to have sunrise in the northern or southern pole due to the orientation of the planetary magnetic field?
5
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1answer
173 views

Could this planet's tail be visible?

I have 2 planets, a hot Jupiter with a standard majority Hydrogen/Helium atmosphere (Ab) & an Earth-like planet(Ac) orbiting around an orange dwarf star (A) which is very similar to Epsilon ...
4
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3answers
129 views

How to make a light purple atmosphere, and which color would plants be? [duplicate]

So in this world I was writing about I need one exclusive zone of the planet to be purple and their plants to be adapted to this atmosphere. What would I need?
1
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1answer
142 views

Sugar World Formation?

I was watching Star Wars the other day, when the scene came to that salt-covered planet, Crait. I was wondering, would it be possible for a planet to have flats and mountains and other geological ...
3
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1answer
105 views

Sun rising from different directions throughout a lifetime

I'm fascinated by The Dark Tower series of books by Stephen King. One of the aspects that I love most is the distortion of space and time: Roland's world is said to have "moved on", and it ...
6
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3answers
140 views

Once you've calculated the tidal heating of your moon, how do you calculate the surface temperature?

Let's say you've calculated the tidal heating of a moon in Watts using the method described in How does one calculate the tidal heating of a satellite?, how do you then convert this to surface ...
10
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6answers
2k views

chance of surviving a planet killer explosion

Our main characters have just arrived at the brand new SpaceStation2™ (now with geostationary orbit!) soon they get settled in with the other characters already there, then the planet explodes, no ...
3
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4answers
99 views

How would volcanism be different on a terrestrial planet denser than earth?

Specifically, how would volcanism be different on a terrestrial planet with these parameters: Mass: 0.38 Earth Radius: 0.7 Earth Density: 1.1 Earth
5
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3answers
350 views

Plausible reason for decreased oxygen levels with increased plant life

So, as per my Oxygen levels and explosions question, there is a planet with substantially lower oxygen (16%) and a planet with higher than average oxygen (25%) that are fairly earthlike in temperature,...
11
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3answers
2k views

What would a Rainbow look like on an earth-like Planet orbiting a Red Sun?

Okay, so in my setting I'm writing, the planet is very earth-like, similar atmosphere, liquid water exists, etc.. But the planet orbits a red giant. I've done a lot of fiddling around with various ...
-2
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1answer
53 views

Is my air pressure system okay? [closed]

Second question here. So in a previous question I got told to make a wind system to determine precipitation, which in turn needs and air pressure system. I've attached two images, the first is when ...
5
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4answers
189 views

How would a torus planet's magnetic field work?

Simply put as the title says. I'm going to handwave that the planet is held together with magic, but I want to know how a magnetic field would work on a toroidal planet- assuming such is even possible....
8
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2answers
298 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 ...
5
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0answers
98 views

Is my topology/are my climate zones alright?

This is my first try at worldbuilding, and I need some feedback. I've filled in what I hope are realistic climate zones, ocean currents and topology for this current state of the world, all done in ...
21
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6answers
3k views

How can a natural process create a near-perfect geometric shape as the most prominent feature of a planet?

Starship Not-Enterprise exits hyperspace and looks at the planet filling up the window. Their jaws drop. The planet has a perfect geometric shape clearly visible from space, occupying the majority of ...
6
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4answers
519 views

How to cool a planet's core to avoid inconvenient melting during deconstruction

We start with one small (but perfectly formed) planetoid. Just for the sake of discussion, we'll say it's Mercury. This planet is more or less useless to me, being too small and too close to the sun. ...
2
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0answers
54 views

Alpha Centauri/Binary Star Planet Orbits

One of the physical constraints to planetary systems around Alpha Centauri A and B that many papers have pointed out is that the planets would need to orbit in the plane of the A-B Orbit, not the ...
0
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2answers
101 views

Would an elecroweak star radiate similarly to a normal star? If so, would a habitable zone around it even be possible?

An electroweak star is a theoretical exotic star in which the radiation pressure from its core keeps it from collapsing into a black hole. Because of its theoretical nature, it's hard to find a lot of ...
7
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3answers
156 views

What's the minimum possible size for a planet to have rings?

How small can a planet with rings be? It doesn't have to be inhabitable, but it must be a planet (not a dwarf planet).
3
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2answers
121 views

What effects would an extra few moons have on my planet?

While I was worldbuilding I thought about how cool it would be if my planet had maybe two, maybe three moons. Does this change the world itself? For example: How are the tides and ocean affected? How ...
17
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10answers
3k views

How could a subterranean alien lifeform develop space travel?

I have a sentient lifeform populating an Earth-like planet in terms of gravity / composition. But since that world is close to an old K Type star, the atmosphere is evaporating and letting UV rays ...
3
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4answers
131 views

Does the mass of a planet affect the size of living organisms?

I’m trying to do some world building for a game I’ve been working on, and so I’ve been designing a planet that would fit large fauna and flora. What I would like to know is if the mass of a planet has ...
3
votes
1answer
92 views

How could life exist underneath a world too small for a magnetic field?

In a new documentary made by melodysheep called LIFE BEYOND II: The Museum of Alien Life, the creator proposed there could be life on a planet too small for a magnetic field beneath the surface. But ...
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0answers
59 views

Plate Tectonics/Geology on Carbon Planets

After researching on and off for a few months, I thought I had how a Carbon Planet would work down right, up to and including an ammonia-based xenobiology, but a video I saw today got me wondering if ...
5
votes
2answers
109 views

What are the orbital characteristics of my double-planet system?

I'm trying to figure out the orbital characteristics of a double-planet system, kind of like Pluto and Charon, but much more equal in size. One planet is pretty much a perfect copy of Earth and the ...
6
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5answers
621 views

Could an earth like planet turn into Venus and then back again?

So, I have an Earthlike planet with a healthy biosphere, and I need to completely reset all complex life on it. Near as I can tell, one way to do this is by totally destroying the atmosphere (after ...
5
votes
1answer
165 views

How to Determine Planetary Extremes of Temperature from Average Global Temperature?

I have determined the average global temperature of my world based on the luminosity of the star, distance to the star, and the bond albedo and greenhouse factor of the world. What I'm having a devil ...
4
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2answers
150 views

How to maximize the sand depth of a desert planet

NB: There is a related question – What kind of planet could have giant sand worms? – but this one is concerned specifically with the sand. Giant sand worms would be awesome incidental. Assuming a ...
21
votes
8answers
5k views

What would happen if you blasted a hole through the earth?

During a battle between two extremely powerful space wizards, a beam of magical lightning has blasted a perfectly circular hole around 10 feet in diameter directly through an Earth-sized planet. In ...
3
votes
1answer
90 views

Time to develop a human breathable atmosphere on a captured frozen wandering planet

Suppose that a wandering frozen planet is captured by a star and this planet could develop an human breathable atmosphere. How much time could the process take? EDIT: the planet is earth-sized with ...
3
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3answers
131 views

Could life exist on a tidally locked planet? [duplicate]

Could a planet with one side always facing its star have a temperate zone between the far side and near side that can be suitable for an ecosystem to exist? Here are the conditions: The planet has an ...
7
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6answers
1k views

Is this celestial body of noticeable uneven density possible and what would be its shape?

Disclaimer I am not sure whether this question belongs here or in the Physics SE but I'm posting here due to the fictionnal aspect of the celestial body. Context I'm writing a story where humans ...
10
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4answers
1k views

Planet unhabitable by certain demographic [closed]

Space explorers with same tech level as in alien franchise found a planet. Planet had some carbon based, earth-like flora and fauna on it, but it still needed some additional touches, not a full blown ...
3
votes
2answers
96 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 ...
6
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4answers
1k views

What is a material that might be missing on a planet that the inhabitants of said planet need to go pick up on a gas giant nearby?

I have this Earth-like planet that is running short on materials, like minerals and gasses, and they have a big spaceship that is able to gather materials from a gas giant that orbits the same star ...
1
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1answer
49 views

Impact of global volcano eruption into artificial structures

A suplement to this question this time targeting human constructions and artificial structures. Imagine that one day all Earth volcanoes has erupted in the same moment. How would running lava, ash and ...
3
votes
1answer
89 views

Environmental effects of global volcano eruption [closed]

Imagine that one day all Earth volcanoes has erupted in the same moment. What impact would such event has on nature and environment? How would running lava, ash and gases blowing from volcanoes impact:...
5
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2answers
202 views

How to blow all Earth volcanoes in the same time?

I would like to eliminate entire human race, by turning Earth into second, world-sized Pompeii. I'd like to destroy all "habitable areas" so that human population would be effectively ...

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