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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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4 votes
1 answer
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If ancient Venus really were once habitable, what was its atmospheric composition and average surface temperature? [closed]

Some sources claim that billions of years ago, Venus may have had much cooler temperatures, enough for liquid water on it’s surface and these clouds on the day-side of Venus would raise Venus’ albedo ...
casualworldbuilder's user avatar
12 votes
10 answers
3k views

How much time is needed to judge an Earth-like planet to be safe?

A colony ship has been sent to deep space to colonize an earth-like planet. Through astronomical spectroscopy, the atmospheric composition was found to be suitable for human life. But of course, ...
user73910's user avatar
  • 943
4 votes
2 answers
219 views

If an otherwise too massive planet rotates fast enough, would the equatorial region become habitable?

Ok, So I'm writing with an eye toward pondering the constraints of terraforming, which are more numerous than most people think, which creates a plethora of fun quirks and constraints for story ...
E. B. Kinder's user avatar
-5 votes
1 answer
101 views

Why can’t we export everything needed to heat mars up from earth. So why not use the things that are heating earth right now on mars. We have enough [closed]

If we want to warm up mars, exportion is the solution. Cows, produce about 200-500 methane. burning fossil fuels total about 34 billion tonnes of carbon per year. About 45% of this is from coal, about ...
matt tune's user avatar
17 votes
8 answers
6k views

If humans colonized Earth 100,000 years ago, would we know it?

Let's say that humans actually originate from another planet. An extinction level event happened on their home planet, and a handful of them escaped, wandering through space looking for a planet that ...
www's user avatar
  • 1,525
4 votes
2 answers
373 views

Could a civilization have existed on earth when our planet was much smaller, and as earth gained more size could it have grew around and above them? [closed]

I want to create a civilization that were living on earth when the planet was a much smaller protoplanet or a planetesimal. If earth grew over billions of years, could a civilization have existed ...
Traline DèMon Spencer's user avatar
4 votes
2 answers
79 views

Could a mini neptune host life only above certain elevations?

So on a planet with a small gas envolope of say, 20,000 km, could you have a situation where life only exists above the envolope, on the mountains that poke through it? Is this theoretically possible?
www's user avatar
  • 1,525
5 votes
5 answers
1k views

On a planet with 6 moons, how often would all 6 be full at the same time? [closed]

The cycles/orbital periods of the moons are 12, 20, 20, 24, 32, and 38 days. How often/after how many days would all 6 be full at once?
None's user avatar
  • 155
2 votes
2 answers
128 views

Would it be possible for a somewhat distant bianary star system to have a planet orbiting their barycenter within both their orbits?

There are 2 stars in a binary system, 268 AU apart from each other. Both are about 1 solar mass. Would it be possible for some planet to be orbiting their barycenter (the center mass of both starts),...
OT-64 SKOT's user avatar
  • 4,626
4 votes
2 answers
111 views

How to prevent ice caps from forming on cold planets?

I am currently working on one of the planets in my system, called Opea. Opea is a roughly earthlike planet in the furthest edges of its star's habitable zone (receiving half the sunlight as Earth), ...
Dione Moolman's user avatar
3 votes
1 answer
104 views

At what rate does my planet become tidally locked?

I am designing an alien planet for a speculative evolution project. It is slightly less massive than Earth and is orbiting around a red dwarf, within the Goldilocks zone. It takes 220 Earth days to ...
Ambjörn's user avatar
  • 208
0 votes
1 answer
115 views

How would a monster be part of a planet's core? [closed]

Okay so I know this absolutely isn't possible but what is the most likely way this would be possible? This idea is also very much still in progress but I think asking this would help. I'm thinking of ...
racinu's user avatar
  • 11
10 votes
2 answers
335 views

Sky color other than blue

Is it possible to have a planet where humans can survive for >30min outside, where the sky color is anything but blue? In anime and sci-fi, there are planets with a purple / green /red / yellow / .....
subrunner's user avatar
  • 4,572
0 votes
6 answers
2k views

Is it possible to relocate a planet? Specifically Jupiter [duplicate]

My world, Anyare, has too many people on it. Instead of having a disaster, I want them to colonize another planet. Like Jupiter. By using Jupiter’s gases, and by attaching a giant propeller, is it ...
HankyH's user avatar
  • 25
5 votes
5 answers
612 views

Would the equatorial region on an alternative Earth spinning on two axes still be +/- 5° above the median "equator?"

Imagine, if you will, the Earth. It's happily spinning around its axis, which is about 23.5° off the perpendicular of its ecliptic. Now, for no scientific reason whatsoever, start a second spin around ...
JBH's user avatar
  • 126k
6 votes
3 answers
2k views

Could Jupiter-like planet be able to radiate energy to sustain life on satellite?

I remember being taught about Jupiter being believed to be a failed Sun. I also am aware that Jupiter releases energy like the Sun. I am sure some of this is in relation to the sun as well. But due to ...
Silas's user avatar
  • 61
3 votes
2 answers
380 views

Can a cube-shaped(ish) world have uniform(ish) gravity when composed of ideal materials, including antimass?

I'm trying to design a cube world while sticking somewhat closeish to real physics, but am not entirely sure about the physics involved with objects of non-uniform density, specifically as relates to ...
DDriggs00's user avatar
1 vote
5 answers
586 views

Could a small (15km radius) planet (disregarding physics) have enough material for intelligient life to build on?

The planet's radius is 15km and has a similar density and gravity to Earth. For this question, most laws of our universe do not apply, meaning this is possible without any serious consequences. Could ...
value1's user avatar
  • 146
3 votes
1 answer
77 views

Water distribution on tidally locked planet with small northern ocean

Possible repeat of this, but the northern ocean wasn't really addressed. Picture a mars-like planet, with a rocky, mountainous southern hemisphere, and a flatter, low-elevation northern hemisphere. ...
planetQuestioner's user avatar
3 votes
2 answers
164 views

How would fires turn out in my planet's atmosphere?

So, my planet is a Halogen world (like Stephen Gillet's Clorox), it has an atmospheric pressure of 7.54 atm, with it being composed by: 93.09% N2 6.569% O2 0.201% Cl2 0.101% Ar 0.039% others (CO2, Ne ...
UltraLore's user avatar
8 votes
8 answers
4k views

If the Earth stopped spinning, what's the ideal point for it to stop to ensure the most people survive?

Say the Earth were to stop spinning, and became tidally locked (or rather, stop spinning 366.25 times a year, and only once a year), through the machinations of a superpowered alien visiting down on ...
iolim5678's user avatar
  • 175
2 votes
2 answers
1k views

The "Face" in Cydonia, Mars

I want to write a story in which colonists on Mars form a religion around their belief that the so-called "Face" of Cydonia is artificial - and they're right. However, the establishment ...
ajderxsen's user avatar
  • 121
3 votes
2 answers
125 views

Would a planet whose sun is always in one place have weather?

The world I’m writing atm has a planet whose sun is described as being permanently moved above its North Pole. Because of a lack of technology (and interest) in outer space, they wouldn’t have a ...
Rainsford's user avatar
9 votes
3 answers
701 views

Color for this sky [duplicate]

Based on the information given, what would be the color of the planet's sky? Here is the composition of the planet's atmosphere: Nitrogen: 64% Ammonia: 19.7% (edit: as answers have pointed out, it ...
Neil Iyer's user avatar
  • 1,543
0 votes
7 answers
1k views

Is it possible to make a planet full of water and at the same time without life?

It's me again, I want to ask if it is possible to make a planet full of water but it has no life, the idea that it is a planet full of water with small islands in which there is no life, here is the ...
Idon'tknow's user avatar
3 votes
6 answers
695 views

Can you have a planet as bright as Venus orbiting at 1.0 AU with no significant atmosphere?

I'm basically trying to have a hot volcanic planet with lots of visible lava within a short distance of my pov planet, so that it would be large in the sky; orbiting at 0.9-1.1 AU. I want it to be ...
Sam Moon's user avatar
  • 631
2 votes
2 answers
119 views

What are some plausible, long-lived geophysical planetary processes which would consistently maintain reddish skies in a human-breathable atmosphere?

Note for clarity: By reddish skies I mean being reddish in the same way Earth's skies are blue. This should apply to the skies in general (not a localized effect), and it's preferable that it's an ...
PedrohSpaceWolfy's user avatar
7 votes
1 answer
145 views

How do Hill spheres work for binary planets?

A small moon is able to maintain a stable orbit around a planet at just under half the radius of the planet's Hill sphere. Most of Jupiter's moons are in this configuration, possibly made more stable ...
Charles Rogers's user avatar
8 votes
5 answers
958 views

Can a Venus-like planet be habitable if it was farther from the sun?

Let's take a planet with an atmosphere as dense as Venus, where there are extremely high winds far above the ground, but it's fairly tame at the surface itself. Perhaps the clouds are made of a nicer ...
Sam Moon's user avatar
  • 631
4 votes
1 answer
142 views

What are the climatic consequences of existing on a planet with a dense and fairly cold atmosphere?

I am making a non-habitable planet (Name: Xoo-akedar) for my solar system. Despite being close to the star (see characteristics below), it has a dense atmosphere that prevents the heat from the star ...
Idon'tknow's user avatar
3 votes
1 answer
133 views

Could a biological organism power itself with electricity like a smartphone (or something similar)?

Imagine an alien world where there are are shallow lakes where electricity generating beings (like electric eels or whatever) would power many of the land dwelling creatures, including the dominant ...
Mishima's user avatar
  • 1,019
7 votes
3 answers
785 views

Feasibility of a bio-engineered, floating tree lifeform in the Venusian atmosphere?

Would it be possible, given many advances in genetic engineering that today remain speculative, to design a lifeform capable of withstanding the hostile conditions of the Venusian atmosphere? I'm ...
Aeolian's user avatar
  • 71
1 vote
2 answers
238 views

I have a world with two moons, and I was wondering how often they would both be full at the same time

As I said in the title, I have a world with two moons. One has an orbital period of 17 days Earth days (Moon 1) while the other has an orbital period of 57 Earth days (Moon 2) and the planet they are ...
Jack Kibatsume's user avatar
6 votes
3 answers
722 views

Frozen World Atmosphere?

There's a planet in my world's solar system that used to be habitable but was knocked off course. its been frozen for about 4 billion years in the present time. I'm wondering if the atmosphere would ...
Raka Holiday's user avatar
3 votes
2 answers
133 views

How to calculate the Draconic month on a fictional world

I am working on a world and want to be able to find out when Eclipses occur, and I found you need to know the Draconic Month, I think I have everything I need to find it, I have the inclination to the ...
DanceroftheStars's user avatar
5 votes
6 answers
3k views

How could Venus be partially terraformed?

In my setting, Venus is still very much still hostile to a normal human without equipment, but isn't hot enough to melt lead and has a relatively low pressure compared to now. How could this ...
user avatar
6 votes
1 answer
906 views

Time dilation on a heavily oblong planet

Once upon a time writer Hal Clement had created a world named Mesklin. One of features he didn't detail for historical reasons is a time dilation between polar areas, where gravity is 700g and equator,...
Swift's user avatar
  • 193
6 votes
3 answers
295 views

Can a planet with rings support life?

Is it at all possible for complex life to evolve and exist on a planet with rings? I assume the rings would have to be rock, since if the planet is to support life, it will have to be in the habitable ...
mza's user avatar
  • 161
0 votes
2 answers
95 views

Plausible Martian Underground Colony

I'm looking for scientifically plausible zones for pioneer colonies on Mars. I will have them living underground for radiation shielding, water sourcing, and geothermal for energy, so somewhere with ...
CS Simpson's user avatar
2 votes
1 answer
109 views

Life in the core of a rocky planet

Background First of all, I’d like to state that I know the entire premise of this question is hypothetical and the life probably quite unlikely to form in the first place at best. Despite that, I’d ...
Neil Iyer's user avatar
  • 1,543
1 vote
1 answer
113 views

What are some things to keep in mind while designing a binary planet system with a sun-like star? [closed]

My planets are both the same size as Earth, with about the same water:land ratio. They are tidally locked to each other, but not the star. I don’t know much about planets and orbits and other things ...
Zona C's user avatar
  • 143
15 votes
5 answers
6k views

Life on a planet with never-ending rain

I'm intrigued by the notion of life on a planet where rain is a constant presence. Imagine a world where precipitation never ceases, where the skies are perpetually gray, and the sound of raindrops ...
Alessar's user avatar
  • 521
16 votes
3 answers
5k views

What is the largest fraction of Earth's sky that an astronomical object could take up (visually) before ripping Earth or itself apart?

I know the Roche limit limits how close another planet could get to Earth. Closer than that limit, and either it breaks apart or Earth breaks apart. I don't care what size it is, if it's a super-...
cowlinator's user avatar
  • 1,839
3 votes
0 answers
58 views

Crustal composition of an ammonia planet

I am currently building a planet that weighs about 4 earth masses and is 2.3 earth radii long. It is an ammonia planet (as the title suggests), and has ammonia oceans with some dissolved water ice, ...
Neil Iyer's user avatar
  • 1,543
6 votes
6 answers
2k views

Illuminating Minerva?

It would be convenient for both astrophysics and for the plot of the story set in this world if there exists a ninth planet in the Solar System far outside Pluto’s orbit (with appropriate mass, Ap, Pe,...
controlgroup's user avatar
  • 5,170
4 votes
1 answer
56 views

What should be characteristics of orbit of planet with sustainable climate if north is covered by ocean and southern by desert?

Planet Artemis depicted at my pictures has totally different characteristics of northern and southern hemisphere. Northern hemisphere is covered mainly by ocean, southern by desert (except two seas, ...
GiuseppeZee's user avatar
1 vote
9 answers
1k views

Can I create a world of stationary planets? [closed]

I have created this massive world composed of 15+ planets, all elevated in space, surrounded by stars and countless other uninhabited/desolate planets. Is this even possible? Do I have to create a ...
bookloverKM's user avatar
4 votes
1 answer
93 views

Could a planet with an unusually high heavy metal content sustain life? [closed]

I'm playing around with the concept of a planet containing unusually high heavy metal content, due to being born in a nebula that resulted from a neutron star merger. What conditions would this planet ...
Ellie Cressy's user avatar
4 votes
1 answer
81 views

Necessary distance for an ammonia world from Toliman

I am designing a planet that orbits the star Toliman, (Alpha Centauri B), which orbits well beyond the conventional Goldilocks zone. This planet has a similar radius to earth (6240 km) but its mass is ...
user98816's user avatar
  • 8,657
5 votes
3 answers
1k views

Could mountains form on anhydrous planets?

The primary mechanism for mountain formation (of which I'm aware) is uplift of the crust, with rivers eroding their way through softer sediments as the crust rises to form peaks and canyons. That ...
Rabadash8820's user avatar

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