Questions tagged [planets]

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

Filter by
Sorted by
Tagged with
3
votes
3answers
183 views

Gas Giant with solid surface

I have the feeling the answer to this will come down to ''impossible'' but let's ask anyway to be sure. We know gas Giants have no solid surface and if you tried to land on one you would fall into ...
5
votes
1answer
313 views

What is the largest dragon that could take off without destroying the planet?

Inspired by this answer: Suppose there is an enormous dragon sleeping underground (let's not worry about the biomechanics of how such a creature could exist). One day, it wakes up, shakes the earth ...
1
vote
1answer
147 views

Effects of multiple moons on a planet

Judging by our own planet we know what the effects of a moon on a terrestrial planet are. We also know that if a planet has two moons on the same side you would get insane tides and that two moons on ...
12
votes
3answers
414 views

How close to each other can Earth-mass planets plausibly form from the protoplanetary disk?

We occasionally get questions and answers that discuss how close to each other planets can be and still meet some criteria. For example, this answer to the question ''Habitable'' planet close to a ...
8
votes
5answers
2k views

''Habitable'' planet close to a star

Imagine if you will a star comparable with our sun and a planet like earth orbiting at roughly the same distance around this star as our earth around the sun. Would it be possible to place a planet ...
9
votes
2answers
419 views

What is the theoretical maximum number of habitable planets in one solar system?

In the DC comic book universe, the Vega System is a solar system around the star Vega (Alpha Lyrae), which is depicted as having dozens of habitable planets. While it seems to be an implausibly large ...
4
votes
3answers
242 views

How to get rid of the rainforest for a desert moon with only habitable poles?

I wanna build a habitable desertworld which is a gas giant moon. The desired and already semi-fixed parameters are: mass between 0.4 and 0.25 Earth-masses only 10 to 30 percent global ocean cover, ...
6
votes
1answer
135 views

What set of circumstances are most likely to lead to a planet with a climate resembling the Great Plains?

Part of my story will be set on a planet where a culture similar to that of the Old West has arisen - cowboys, frontier towns, homesteaders, etc. In order to make this development more plausible, I ...
4
votes
2answers
249 views

What would be the effects of replacing the Moon with an Earth-like planet?

Let's assume that for whatever strange -- probably magical -- reason, the Moon was suddenly and instantaneously replaced by a planet identical to Earth in terms of mass and size. Its orbital path is ...
56
votes
9answers
15k views

What impact would a dragon the size of Asia have on the environment?

Without going into unnecessary detail, one of the races of my world believe that the land itself is a dead god, and that by resurrecting it, it will ascend to the cosmos and carry the faithful upon ...
13
votes
6answers
4k views

How would someone destroy a black hole that’s at the centre of a planet? [duplicate]

For starters, the black hole is temporarily contained. But once it’s containment fails it will devour the planet. Obviously, that’s a bad thing. What’s a reasonable way to prevent that? Also the ...
4
votes
2answers
138 views

Looking for a review of my tidally locked red dwarf planet system specs!

Hello! I've put together my first planetary system, but as I'm not a scientist (and bad at maths) I'm reaching the limits of my brainbox and would really appreciate some fact checking! I have ...
6
votes
1answer
135 views

In what ways would the earth's orbit/atmosphere/ocean currents have to be different in order to create summer with long nights?

As far as I know, summer and winter are governed by the amount of sunlight absorbed per unit area, where longer days would increase the temperature along with a higher sun angle. To elaborate on the ...
-1
votes
4answers
277 views

Can huge planets be seen from tiny planets?

Imagine a habitable, water covered, small earth-like orb in space. Let's call it P. From its surface, you see 2 large glowing masses, different sizes, in the sky, let's call them Bs. They are not ...
0
votes
3answers
83 views

Would Such an Axial Tilt Exist on These Worlds? [closed]

In this scenario, there are two Earth-sized planets orbiting one same sun, but they are literally as different as day and night. Both have a 48-hour rotation, but: Planet A has a polar winter in ...
12
votes
5answers
1k views

In order to successfully have 3 orbital rings around a planet how do you have to orient them?

I am writing a short story about an overworked planet whose civilization has achieved space elevators and orbital rings. The planet, which is earth-sized, has three complete orbital rings in stable ...
5
votes
2answers
189 views

How to figure out layers of the atmosphere?

Earth's atmosphere, as you probably know, is divided into five layers - the troposphere, stratosphere, mesosphere, thermosphere and exosphere. https://en.wikipedia.org/wiki/Atmosphere_of_Earth#...
5
votes
1answer
151 views

How many terrestrial moons can my planet hold?

I have a Gas Giant with 13x the mass of Jupiter. How many satellites of Earth size and mass can it hold safely in its orbit? Edit: This gas giant lies smack dab in the middle of its parent star's (...
15
votes
3answers
1k views

Hiding a solar system in a nebula

I have a planetary system with a yellow dwarf similar to our own Sun and three habitable planets. I want to hide this system from sight and long range scans in a nebula, a giant cloud of dust and gas ...
0
votes
2answers
92 views

Habitable planet for people [closed]

So I am making a planet for people to live there, but I have trouble making the conditions that could sustain life. So I had an idea of having a planet bigger than Earth, rotating aroung a star that ...
6
votes
1answer
118 views

How much surface water do I need for plate-tectonics on a planet?

I want to build a habitable desert gas-giant moon and I´m not sure how little water I can give it and still get plate-tectonics instead of an Io-like lid-tectonic setup. I want plate tectonics because ...
11
votes
3answers
164 views

Equatorial oceanic river caused by tides

The setting: A planet with two main landmasses, each one's center located more or less at each pole of the planet. Liquid water ocean in between them, wrapping fully, if not directly (due to the non-...
6
votes
3answers
248 views

Super earth habitability

I'm trying to build a super Earth that's capable of sustaining human life for space exploration in a way that's close to reality. So far I'm lacking some understanding of planetary science and human ...
27
votes
5answers
7k views

Could you fall off a planet if it was being accelerated by engines?

Some background In the movie The Wandering Earth, the rotation of Earth is slowed to a stop, and then 10000 engines are strapped to one side of the planet and used to accelerate it out of the solar ...
0
votes
2answers
143 views

Military for a planet-wide nation [closed]

The setting is: Imperial Guard (Astra Militarum) in the Warhammer 40.000 universe. I find their regimental structure too unrealistic, sending only a few regiments to defend/attack a given planet. So ...
7
votes
2answers
288 views

What levels of Argon and Neon (along with other factors) are needed to make the entire sky orange and sustainable for life?

I've read several sites and even questions on here where the sky would appear almost white or light blue if it orbited an orange dwarf star. However, that is if the planet has the same atmosphere as ...
4
votes
3answers
268 views

Planet with Gridlike Seas

An Earth analog had been modified by an advanced species to have saltwater seas in an interconnected grid across the planet's surface. The planet has no true oceans and only the large grid network of ...
4
votes
0answers
119 views

What would need to be different from Earth in order to make mecha a viable aspect of warfare on a planet? [closed]

There are lots of great questions and answers on this site about how and why bipedal mecha are near useless on earth, and why spiderlike mecha could perhaps have some niche uses which are unlikely to ...
1
vote
1answer
88 views

What would life be like on a habitable, non tidally locked planet around a red dwarf? [closed]

A significant portion of one of my stories is planned to take place on Luyten B - https://en.m.wikipedia.org/wiki/Luyten_b - a potentially habitable exoplanet not far from the Sun. This is a rocky ...
4
votes
10answers
522 views

How can I make the Solar System uninhabitable?

For the Universe I am creating humanity has devolved into groups of scattered tribes. This is due to the fact that we ran afoul of a really nasty alien race, who decided to leave us homeless. A ...
0
votes
2answers
130 views

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 ...
19
votes
2answers
2k views

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 ...
10
votes
2answers
201 views

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 ...
14
votes
3answers
248 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 ...
3
votes
5answers
214 views

How to annihilate all life on a planet? [duplicate]

...
6
votes
2answers
397 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 ...
7
votes
2answers
218 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 ...
3
votes
4answers
156 views

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, ...
2
votes
4answers
179 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 ...
4
votes
4answers
166 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, ...
7
votes
3answers
142 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 ...
6
votes
1answer
213 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 ...
2
votes
3answers
382 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 ...
0
votes
5answers
155 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, ...
-1
votes
1answer
164 views

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 ...
3
votes
2answers
188 views

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 ...
0
votes
1answer
111 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 ...
1
vote
1answer
77 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 ...
7
votes
2answers
336 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 ...
10
votes
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 ...