Questions tagged [planets]

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

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3
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3answers
106 views

Can a planet with blue glowing plants exist?

I have a planet where I want all plants to be blue and glowing. I was thinking that they could use something other than light for energy. I want the plants to always glow. The atmosphere is basically ...
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3answers
61 views

Ways to increase temperature and still be habitable by humans

I am designing a planet that humans can live on for a few tens of thousands of years, while they are hiding from some sort of inter-galactic police force (or whatever). Therefore, it's important that ...
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5answers
909 views

Can an atmosphere be thicker at higher altitudes?

Can a world exist where the atmosphere is actually thicker at some altitude than at sea level? If so, what mechanisms would be involved?
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2answers
113 views

Feasibility of a massive and nigh-permanent sandstorm?

In my military sci fi story in which a squad of private contractors have to contend with hostile creatures reliant on scent and mechanoreception to hunt, I wanted to keep the sci-fi 'hard' and ...
22
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21answers
6k views

How to explain that there can only be one magic portal between a planet and another

I want to make a world where mages can search for and establish portals between a planet and another, but in a way that only one portal can exist between planet A and planet B, one between A and C, ...
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12answers
6k views

Planet with only plant life?

Is it possible for there to be a planet where no animals, only plants existed? What evolutionary reasons would cause this, if possible?
4
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1answer
86 views

What would life (some of it humanoid) be like on a planet with high amounts of silver?

The planet I’m developing has iron in low supply but a high concentration of silver. The planet is habitable for humans and for story reasons the sentient race must be humanoid. Is it feasible for ...
16
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4answers
718 views

How do I calculate the hours of daylight on an arbitrary planet for a given day at a given latitude?

I want to be able to graph the change in daylight hours across the year for a given latitude, to get an idea of what kind of cycle in available daylight people at that latitude would live through and ...
9
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2answers
1k views

What kind of effect would low gravity have on geography? [closed]

What kind of effect would lower-than-Earth gravity have on the geography of a smaller-than-Earth terrestrial planet? The Gravity is lower because the planet is smaller, the core must be large enough ...
4
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0answers
82 views

How Would These Planets Affect Earth's Eccentricity?

A cleaner, narrower-focused improvement of How This Alternate Solar System Influences the Milankovitch Cycle, so not a duplicate. For further clarification, eccentricity is the shape of a planet's ...
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0answers
24 views

What would a planet with a notably high sulfur content but otherwise Earthlike composition be like? [closed]

I'm currently working on making a planet with mostly Earthlike chemistry, but I want to throw something into the mix to make it distinctly different from Earth and most likely uninhabitable to ...
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3answers
280 views
+100

What would the geologic record look like on a planet in the galactic halo?

Imagine an Earth-like planet orbiting a Sun-like star in the inner halo of the Milky Way. As a halo star, it will likely be somewhat metal-poor, having formed early in the life of the galaxy, but ...
5
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1answer
94 views

Could an alien species from lower gravity survive on Earth?

I remember reading this thing somewhere about how humans born in zero gravity environments would likely be taller than Earth-bound humans but also more fragile and unable to handle Earth's gravity ...
6
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1answer
111 views

The Earth and Moon resolidify under a bluer star, their outer layers evaporated and burned away. What do they look like now?

(This is the third in a series of questions, starting with Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands? and How soon does the Earth's ...
2
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1answer
56 views

Is it possible to have a greenhouse effect this strong and still have an atmosphere breathable by humans?

An Earth mass terran planet is orbiting a sun-like star at 2AU. I understand the limit for CO2 greenhouse effects is 1.67AU for whatever reason (giving a conventional habitable zone limit), but ...
4
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2answers
75 views

Possible compositions of a rogue binary system?

I am attempting to construct a world that is primarily lit by light filtered through and reflected off of a crystalline moon so that, at its brightest, the planet receives about the same amount of ...
6
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6answers
225 views

How could an Earth-like planet support all-metal airships?

When I say all-metal airships, I'm referring to something like the above from Jakub Rozalski's artwork - the design is more akin to a naval destroyer or battleship and less like a zeppelin. We've seen ...
7
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2answers
284 views

How soon does the Earth's surface re-solidify after the red-giant Sun is replaced with a different star?

(Note: This is a follow-up question to my previous one: Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands?) Thanks to clever stellar engineering ...
5
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2answers
210 views

How to Make This Alternate Earth as Black as The Dark Knight

"The Dark Knight" is a nickname given by astronomers to the exoplanet TrES-2b, a gas giant with an albedo of one percent, blacker than paint, blacker than coal—in fact, blacker than anything on Earth! ...
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0answers
51 views

Can a river or something flow between two or more planets or celestial bodies in close proximity? [duplicate]

By some silver of possibility, conider that there are planets that are not of the same size but significantly large that it couln't be called a satellite. They are extremely close near the with same ...
5
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1answer
112 views

Factors that determine the geology of a planet (what factors determine the elemental composition of the planet)

This is my first world and I want to build in a way that is physically possible (if this is possible, otherwise make the necessary changes) for my civilization (which is mostly fleshed out) but I don'...
5
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2answers
167 views

What if Jupiter and Mars swapped orbits?

I am wondering how will it affect earth or none at all. Seeing that Jupiter by far is a gas giant and has really strong gravitational pull while Mars is mostly dormant, weak gravity and a terrestrial ...
4
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1answer
199 views

Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands?

Short version A far future catastrophe burns/melts away large chunks of the Earth and Moon. For reasons related to my story's fantasy elements, the remains of the Moon have about one fifth their ...
5
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1answer
79 views

How extreme can a habitable tidaly locked world be?

I want to create a tidally locked world with a habitable (broadly Earth like atmosphere and biome that humans could breathe and live in) band stretching around the terminator pole to pole. There would ...
6
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1answer
74 views

What does a gas giant close to a red dwarf look like?

In my setting, there's a gas giant orbiting in the habitable zone of a red dwarf (for specificity, its radius is about half Jupiter's, and it's 0.35 AU from 61 Cygni B. Ignore the effect of the other ...
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1answer
133 views

Orange Suns and Blue Jupiters

I am developing a fictional planetary system in which a large gas giant planet (slightly less than the mass of Saturn), has migrated into the habitable zone during the formational years of the system, ...
6
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1answer
114 views

Would it be possilble to light the dark side of a tidally locked planet using fiber optics from the right side?

Assume planetary-scale cables are easily constructed, and subsequently ignored. I am assuming these cables would run just under the surface of the planet from one side to the other for minimal ...
4
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3answers
148 views

Alien planet concept: could a completely misty, dark atmosphere be possible?

I was thinking of creating an alien planet that orbits a star slightly past the habitable zone, but is kept warm by an extremely dense atmosphere, made primarily of a black gas, but still contains ...
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2answers
143 views

“Fantastical” Geology in Sci-Fi? [closed]

For a story of mine, I wanted to include the kind of "unnatural" - at least for Earth - geology that you sometimes see in sci-fi. Meaning in this case massive stone spires or land bridges spanning the ...
2
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1answer
72 views

Habitable Planet in the L2 Lagrange Point of a Hot Jupiter

If orbiting in the L2 lagrange point of a large planet (doesn't actually have to be a hot Jupiter, just large enough to fully shadow the smaller planet), how close could you get to the host star ...
9
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2answers
271 views

Incoming Rogue Planet! When do we see it?

So say there was a rogue gas giant about the mass of Jupiter that, unfortunately, happened to be headed directly at Earth (or at least close enough to knock it into an orbit incompatible with life). ...
3
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1answer
148 views

When will the last white dwarfs become black dwarfs?

I want my planet to be the last planet in a universe to host life forms. I expect a rough estimation as answer. Thanks.
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3answers
152 views

How long would it take to conquer a galaxy? [closed]

I will explain this as briefly as I can. I'm thinking about beginning a novel that has an MC that is born into a race of super-efficient alien invaders. They're able to take over entire planets ...
2
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0answers
27 views

Alternative Ozone Layer [duplicate]

The reason for the high level of Oxygen in the atmosphere today is due to the billions of years worth of photosynthetic prokaryotes releasing it as a waste product. Of course, in the higher levels of ...
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5answers
1k views

How can I get a total solar eclipse to be a yearly event?

In our world, a solar eclipse is visible from the planet a few times a year, in certain locations. However, a total solar eclipse that can be seen across the planet generally happens every three or ...
3
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3answers
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How can solar eclipse magnify the moons effects?

The moon is made up of a substance called warpstone. This rock is solidified Mana compressed into physical form. Pieces of the moon will sometimes fall to earth, which contain magical properties and ...
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2answers
91 views

The major effects on the habitability of exomoons orbiting this Brown Dwarf

I'll need to give some background to this question. I'm interested in the idea of a densely inhabited star system, and having large exomoons is one way that they can all orbit roughly at the same part ...
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2answers
124 views

What would we need to have 1km deep fissures spanning out across the planet?

Art by Sylvain sarrailh What kind of event would we need to have 1km deep fissures spanning out across the planet. I can work with a hypothetical scenario where the planet might have had some sort ...
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1answer
92 views

Can a plant be grown in a vacuum chamber [closed]

Thats my question please answer it
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2answers
144 views

Lagrange systems: What is the mass range for a gas giant if I want to place a earth-like planet on L4 and L5

I am wanting to make a 3 world lagrange system around a Sol analog star that includes 1 gas giant and 2 terrestrial worlds with large moons. I want the terrestrial worlds to have a similar gravity to ...
8
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3answers
347 views

Impacts of a moon falling on an Earth-like planet?

In the world my friend and I are making, the dark lord makes one of the planets uninhabitable by causing a moon, about the size of our own, to fall on it. About 7000 years later, it is unnaturally ...
5
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3answers
99 views

How do i worldbuild planetary regolith

The planet needs to be able to support life but initially ve devoid of it. Which I would think would make it's Soil like that of a desert. The regolith may be important for early agriculture. It can ...
3
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1answer
54 views

plausibility of this double planet system? [duplicate]

So, I'm about to start a new worldbuilding project for a fantasy world, but I want to try to make the basic world at least somewhat plausible; the magic in the setting is going to be pretty low-key, ...
4
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1answer
91 views

How bright is the night with 18-22 AU distant star?

In my previous question, I asked about how close can two stars in a binary system be for planets around them to stay earthlike, assuming that both stars have very sunlike and both planets very ...
7
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4answers
171 views

How far should second star be in my binary system?

For a certain reason, I needed two habitable similar earth-like planets very close to each other. After various information gathering, I gave up on double planet and gas giant moons, because tidal ...
4
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3answers
239 views

How to get time to pass faster on another planet compared to earth?

I'm developing a story where humans colonize a few planets. One planet, lets call it Planet A, has similar gravity to earth, air pressure, and solar radiation. You cannot however, walk on the surface ...
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4answers
120 views

Is this planet-moon system possible?

The planet is 10 Earth-Radii, with a 1 Earth Gravity value. It is a habitable planet. It has a thin atmosphere. It also has 3 moons and a ring system. The moons are rather large. The largest one is ...
5
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1answer
252 views

Software for creating a 3D planet [duplicate]

(Sorry for my English, it's not my native language. I use Google translate.) I am looking for one or more software programs to create a sphere in 3D with longitudes, latitudes, etc. I want to be able ...
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3answers
183 views

How large of a moon could an earthlike planet possess

Suppose I want to have a moon with more gravity than ours how large of a moon can I have and what effects would there be.
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2answers
91 views

Inverse orbital direction

Is it possible that a planet/moon will have inverse direction comparing to the rest orbiting material? For example Mars would go in counter direction comparing to other planets in solar system. If ...

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