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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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9
votes
3answers
301 views

What would the effects be of two tidal locked planets have on each other's geography?

I've heard a lot of people say that having two tidally locked planets close together would have adverse affects on both planets. I have two tidally locked planets at a distance of 16,550 miles apart. ...
8
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3answers
1k views

A planet ringed by stars

Suppose there was a ternary system where the stars are effectively identical in mass, luminosity, radius, etc. These three stars circle a central point rather than two orbiting a larger third. At this ...
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3answers
721 views

Is planetary drill possible?

I was wondering would a planetary drill be possible? The drill should go inside the planet on one side and exit on the other. Would that kind of a drill be possible on Earth and if not on what kind of ...
7
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2answers
392 views

Making a Counter-Earth

In this question, it's pointed out that the L3 Lagrange point, where a "true" Counter-Earth would lie, is in fact unstable, and over time any object there would drift into a different orbit. ...
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5answers
928 views

Is it possible to have two or three planets in a stable orbit together?

I have three planets. Let's call them Un, Deux and Trois. Is it feasible for all three to be orbiting one another, close enough to be seen clearly by eye? All three are large enough to be earth ...
6
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1answer
384 views

Temperatures on a planet with long days

I have a planet with a stellar flux of 1.118, an albedo between Earth's and Mars's, an atmosphere composition of 18% oxygen, 13% argon and 69% nitrogen with a sea-land pressure of 0.87 atmospheres and ...
6
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3answers
725 views

What would weather look like on a world with a 9-year day?

In a world I am building, the planet's days are longer than its years, with a single day taking 9 years. In all other ways, this planet is similar to Earth, but are there other differences I am ...
5
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3answers
662 views

Life on a rogue planet

I am imagining a special ecosystem on a rogue planet (a planet that wanders throughout space without orbiting a star or other heavenly object) but I would need your help to fill in the gaps and ...
5
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1answer
650 views

Can we land on a planet with methane-oxygen atmosphere?

If there is a planet whose atmosphere consists of : 30% methane 70% oxygen Then, can we land on it? If yes, then how, and why would it not explode? Also, can such a planet exist for a long time?
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3answers
347 views

How would aircraft and air-life develop on High-G, Lower-Atmosphere planet?

I'm (slowly) working on a semi sci-fi world, set in a WWII-ish tech level (Semi sci-fi being how they got to this world). Except in this world, aircraft have developed significantly later, and ...
3
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3answers
708 views

Gravity on a Cube World [duplicate]

Say that you have a planet that, instead of being spheroid, is cuboid. How would such a planet form? Wouldn't the gravity pull the matter toward the corners toward the center, causing the planet to ...
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3answers
192 views

Would animals from Earth be able to survive and reproduce on this planet?

Some details about the planet and its moon plus the host star. Star: 0.85 Sol, 0.54% of the Sun's luminosity Planet: 0.04926 (M⊕) 4836 km, 0.34 G, Orbits the host star at 0.901 AU. The atmospheric ...
17
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4answers
2k views

What would it be like to live on a rapidly rotating planet?

On Earth we don't really notice many effects of the Earth spinning, apart from the day-night cycle. It took a long time for people of Earth to realise that it even was spinning, but there are ...
11
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3answers
575 views

Can a planet be on a stable orbit at a Lagrangian point of a binary star system?

Suppose we have a binary star system and a planet at the L4 or L5 point of the orbit of one of the stars around the other. The planet is thus illuminated by the two stars from the same distance and ...
10
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3answers
336 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 ...
9
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2answers
216 views

How can I lengthen a total solar eclipse on an earth-like planet?

I was lucky enough to witness the total solar eclipse crossing the US this past August, but while it was impressive, it was also fairly short - lasting just under two minutes at my location. I'd like ...
8
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3answers
265 views

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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9answers
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Life on Smooth World

Welcome to Smooth World. Most of this planet (at least two thirds, but preferably more) has only tiny differences in elevation, 30-40cm at most. No hills, no mountains, no valleys. Even plains found ...
5
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1answer
255 views

Asteroid flux or: How to make a planet perfect for mining

One of the cool things about the Moon is that the far side has a thicker crust that the near side.1 One theory explaining this is that the Moon was hit by an object, possibly a moonlet created by the ...
3
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2answers
145 views

How many planets should I have in my planetary system?

I am building a planetary system, but I always thought how many planets should I have in this system. When you look at our solar system there are 8 planets. Other exoplanetary systems can have up to ...
3
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4answers
572 views

Why would a planet be spinning fast enough to fly apart?

In a comment to this question imallett brought up the idea of a gas giant spinning so fast that the air is moving at near orbital velocity. In Mission of Gravity Hal Clement has Mesklin spin so fast ...
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2answers
324 views

Effects of forcing a planet to tidally lock onto its moon [closed]

In light of recent reading into Pluto, I noticed that it has the unusual quality of being reciprocally tidally locked to its moon Charon. I have taken this idea and am going to use it in a fantasy ...
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3answers
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What would the consequences be if there was a planet other than Earth, Venus, or Mars that was in the habitable zone?

Okay, there are two habitable worlds in the Solar System. One of them is Earth. Human history goes mainly the way it really went. Then, there is another planet with a sentient, equally advanced ...
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1answer
447 views

Conditions for human life in a Jupiter-like system

I was wondering about a setting where a moon orbiting a gas giant can sustain human life on its surface, i.e. with nearly identical conditions compared to Earth (e.g. size, gravity, mean temperature, ...
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5answers
668 views

Could an advanced species, having evolved on a large planet with a deep gravity well, be helped out of it from above?

Suppose an intelligent species evolved on a large rocky planet, one with sufficient mass that the species had little hope of developing anything anytime soon that could achieve escape velocity. They'...
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6answers
378 views

What abilities might each member of a 4-person planetary recon craft have?

Scenario: A generation ship travels to a star system that has at least one planet that's believed to be potentially habitable and, therefore, a possible location for a colony. After sending some ...
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13answers
11k views

Can a planet be tidally unlocked?

In my answer to another question, I suggested that the Super-Earth in question be tidally locked to its host star for a period of time while part of its surface experienced a bombardment. After that's ...
56
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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 ...
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27answers
13k views

If a large space ship crashes on a planet, what could kill passengers without obliterating the ship?

The situation I'm considering is as follows: A large research vessel with a crew of about 100-200 attempts to land on a potentially habitable planet, but something goes wrong during the descent. A ...
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16answers
6k views

What kind of recurring phenomena could cast darkness on a planet for days/weeks at a time?

A century ago, after a catastrophic event on our planet, many of us were were forced to find a new home. There was one world that caught our attention: a tidally-locked blue planet orbiting a red ...
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3answers
5k views

So we glassed it, now what?

"Glassing" a planet is a common ultimate tactic in Science Fiction, basically it consists in using high power energy weapons to destroy all life on the planet and reducing the soil and rock of the ...
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15answers
5k views

In a world without obstacles, would life evolve wheels?

Imagine a planet whose surface is perfectly spherical, without any kind of obstacles anywhere. In such a world, it would be a competitive advantage for any lifeform to evolve wheels, as transport and ...
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13answers
11k views

1 Light Year Diameter Planet

Suppose a species has limitless resources and the ability to construct megastructures of an astronomical scale. Would it be possible, given antigravitational technology (hypothetical), to create a ...
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4answers
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Would it be possible for an Earth-like planet to have multiple moons with diverse biomes capable of supporting life?

Thanks for taking a moment to help me understand the feasibility of this scenario. Essentially, what I am looking at is an Earth-like world that would be between 1.3x and 1.6x the mass of our own ...
4
votes
1answer
737 views

Consequences or Benefits of a Binary Planet?

I'm curious to the affect a planet would have if it orbited around, or was orbited by another planet of equal, slightly larger mass. Say if Earth had, not the moon, but a planetary object the same ...
39
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20answers
9k views

Reasons why air travel isn't feasible, but ground travel is?

My story takes place on an Earth-like, inhabited world that is far larger than Earth, has roughly 110% of Earth's gravity, and has unusually high (and generally unexplained) EM emissions permeating ...
33
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8answers
2k views

Are “planet of hats” realistic?

Planet of hats is the name of a trope where all inhabitants of a planet share a defining characteristic, of which there are many sub-tropes like environment or economy. I'd like to focus on the ...
20
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5answers
3k views

The Reality of a River World

In a setting I am presently working on, I have envisioned a world similar to Star Wars' Takodana, in that its water is mainly in the form of large rivers, or smaller seas (I generally picture it ...
20
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3answers
3k views

Would an island-covered planet be possible?

Island planets are common in science-fiction, and we've even got a few questions about them in worldbuilding. However, I cannot help but wonder how, or if, they could form. On Earth, at least, our ...
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5answers
5k views

If Earth was tidally locked to the sun, where on the surface would the climate be mildest or most hospitable?

This is specifically about the climate, and where on the planet it would be mildest. Imagine Earth, rotating at the usual distance from the sun. Except, it is tidally locked to the sun; a so-called "...
10
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1answer
325 views

Creating a planetary system that can support six different types of biochemistry

First type - Fluorosilicones in Fluorosilicones, 400° to 500° C Second type - Fluorocarbons in Molten Sulfur, 113° to 445° C Third type - Proteins in Water, 0° to 100° C Fourth type - Proteins ...
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20answers
5k views

Making a Planet Seem Uninhabitable

How can I make it so that an otherwise colonizable planet (or moon) can (entirely naturally) seem uninhabitable from a certain point on its surface? Background: There are a series of immovable gates ...
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5answers
4k views

How dense of an atmosphere do I need to “float” an ocean of liquid at 1000 ft elevation?

I recently watched a special on cave divers in the Yucatan Peninsula and part way through that show the divers encountered a feature called a Halocline, a meeting of two different water masses of ...
18
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3answers
425 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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8answers
4k views

How to explain one side of Super Earth is smoother than the other side?

A spaceship flew across an unclassified region of the Milky Way galaxy and found a Super Earth in an unnamed system. The planet is almost twice as massive as Earth and is orbiting fairly far away ...
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8answers
4k views

What would a planet with no moon look like?

Consider a planet identical to Earth except that it has no moon. How long is the complete day-night cycle on this planet? I've heard that having no moon would speed up the planet's rotation, ...
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5answers
4k views

Could a civilization as advanced as humans exist on a planet/dwarf planet like Pluto?

Could a civilization exist on a planet/dwarf planet like Pluto? It is so cold and barren. Is it possible? What would they live off? They don't have to be humanoid.
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4answers
2k views

Getting a manned ship into space without being detected

In the story idea I'm working on, I'm using the polandball/polish space marines meme as a starting point for the titular space-faring organization. In the story, the meme exists as a way to cast doubt ...
11
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2answers
547 views

Stable ringworld interactivity with other solar system objects

I thought of two questions regarding ringworld structures in solar systems with results I can't assume, so I will try to describe each (assume stability): If a (toroidal) ringworld were massive ...
9
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3answers
424 views

Details needed for day cycle of lunar world orbiting a gas giant

I'm writing a science fiction story set on a moon orbiting a gas giant. I want to understand how the world's day night cycle would appear from its surface and how the world might be affected by this ...