Questions tagged [habitability]

For questions asking about the conditions which are required for the development of life as we know it.

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3answers
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Habitable moon of a gas giant: working out the sizes and distances

I am attempting to create fictional, stable P-Type binary system, featuring a gas giant in a stable orbit, with a habitable Earth-like moon. “Is a Jupiter-sized planet plausible in a habitable zone?” ...
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Making a planet habitable for humanoids: The planet

The question: What characteristics are necessary for a planet to be habitable for humans? What should the generic star and planet be like? The life forms are human, so they Need to have access to ...
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Is this atmospheric composition breathable, and what would it look like?

I have developed a fictional planet with the following atmospheric composition; 60.4% Nitrogen 27.6% Oxygen 9.8% Xenon 1.5% Water Vapor 0.64% Argon 0.06% Carbon Dioxide Is this breathable to humans ...
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Can a gas giant have its own habitable zone?

Gas giants can generate heat via the Kelvin-Helmholtz mechanism. It's oft-repeated that Jupiter actually generates more heat internally via this method than it receives from the Sun. Scale this ...
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1answer
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Making a planet habitable for humanoids: The star

The question: What characteristics are necessary for a planet to be habitable for humans? What should the generic star and planet be like? The life forms are human, so they Need to have access to ...
14
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4answers
6k views

Could we still live if Earth's spin speed slowed down by 90%?

I am working on a project (The Longest Day), and I'm sure some people here have the necessary knowledge to give me some more usefull info. OK, here it is: Lets say that Earth's spinning speed ...
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4answers
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Is a Jupiter-sized planet plausible in a habitable zone?

We lived through loads of questions regarding aquatic races, so buckle up, I am going to gather some ideas around insectoids. The homeworld and race This race lives on a planet which has lower ...
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4answers
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Is it possible that a gas giant of similar size to Jupiter could harbor life?

Say we had a planet which was a gas giant. Is it possible that at the core of the planet where meteors, asteroids, and comet debris had collected that there could be a layer of atmosphere similar to ...
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Is it possible to have a non tidally locked moon?

Fo my question, I'd like the moon to orbit around a saturn-like planet without rings. This moon would be located at a million kilometers away the host planet. the moon's size would be about 12 000 ...
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A planet illuminated by a black hole?

Is it possible for a planet to be heated and illuminated by a black hole due to Hawking radiation at the same intensity as by a star? What mass and size should a black hole have to produce the same ...
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814 views

Naturally making a gas giant moon habitable

Let's say that in my planetary system there is a gas giant around the size and distance from the Sun as Jupiter. I need the planet to be similar enough to earth to be able to be inhabited natural by ...
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Can a situation exist where there is one pole that is hot and another cold on a planet?

I am trying to design a world where one pole is very cold, and the other is very hot. I don't mean that there would be instant death in either, but it is colder than our South Pole on one end and ...
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894 views

What is the habitable zone around my star?

I have built a star that is loosely based on a real-world star. It has the following properties: Spectral class G Mass: 1.03 M$_\odot$ Radius: 1.02 r$_\odot$ Luminosity: 1.05 L$_\odot$ Surface ...
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Planet Tidally-Locked to its star having eclipse day/night cycles?

I'm thinking of a planet with one side too hot, and one too cold due to always facing its star. With the planet having a small ring, a "twilight zone" which may be habitable, I was wondering if a moon ...
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How early was the Earth liveable for today's humans?

Say you were to drop a (bunch of) human(s) at some past era of our Earth. I'm assuming they might encounter a few problems such as the composition of the air not being breathable, the water being too ...
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Reality Check: Habitable moon around earth-like planet

For a complex world-building scenario I want a habitable moon orbiting a habitable earth-like planet. The habitable moon should allow for flora, fauna and landscape as similar to earth as possible. ...
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How small could an Earth-like planet be while still realistically being able to sustain human life?

I'm thinking a planet orbiting a nearby star colonized by human settlers sometime in the not near, but not too distant future. How small could a planet be while still standing in as a relatively ...
14
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1answer
677 views

Can a habitable moon rely on the magnetosphere of its parent planet for radiation protection?

Science-based answers, please. Key points: the main concern is radiation protection for sustainability of human life (and accompanying plant and animal life ecosystems, whether earth-like or not). ...
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498 views

Can this unique planet be colonized?

In the story I'm writing, a gas dwarf (named Eden) is discovered in a triple star system. Its atmosphere is mainly oxygen and water based, and its gravity is slightly higher than Earth's. Unlike our ...
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What Is The Minimum Size Of A Planet To Harbor Human Life?

What is the minimum size of a planet that could harbor human life? You get to decide what the atmosphere is, but I'm reasonably sure that O2, CO2, and H2O are necessary components of the atmosphere. ...
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How far could a planet be from its star and still be kept habitable by intense greenhouse gases?

Epimetheus is a planet with about three times the mass of Earth orbiting a sun-like star in the Andromeda galaxy. However, two major factors separate Epimetheus from Earth. First, it has a thick ...
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Can a planet without one or more moons be habitable?

My titled question was, can a planet without one or more moons be habitable? In more depth, how would that planet be affected overall, without the moon to affect the tides and without providing light ...
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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. ...
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504 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 ...
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What would be the ecosystem on a earth-like planet with substantially less oceanic water than Earth?

In Habitable Planets for Man, Stephen H. Dole proposes that a planet with substantially less oceanic water than Earth could have habitable zones, anyway, even if a high fraction of the surface would ...
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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 ...
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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 ...
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Is a 1:1 Earth possible in a binary system?

I'm trying to build as close to a 1:1 Earth as possible, but finding information on a non-jovian moon-based planet is extremely hard to find. I tend to ramble trying to explain things in a non-list ...
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1answer
464 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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553 views

How long would it take a region to geologically settle down after a major cataclysm?

So in my story/world I have a region that is straight up destroyed...demonic magic is nasty stuff. So we have rings Ring 1 (1 is in the middle) This ring has a diameter of about 200 miles. At this ...
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Fantasy map that has minimal land at the equator. What does this mean for rainforests and the world as a whole?

I created a fantasy map a while back, but only recently have I realised it may have a major problem. There is next to no land at the equator although some land between 0-30 degrees. The vast majority ...
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5answers
561 views

How dark can a habitable planet be?

I'm picturing a world with a permanent, dark, overcast sky, but I'm wondering how dark it can be before photosynthesis is no longer an option. It looks like there are a good number of plants that ...
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2answers
271 views

Rogue Planet Illuminated by Galactic Centre

The black hole question reminded me of an idea I wanted to implement at some point in a space campaign, but didn't go forward with because I was unsure whether it's merely statistically very ...
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4answers
947 views

Is there a habitability zone between the primary and secondary stars of a binary star system?

Is there a habitability zone between the primary and secondary stars in a binary star system for a planet orbiting only the primary star at a distance less than that of the secondary star and, if so, ...
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558 views

Habitability of an icy volcano planet

Suppose we have a rocky planet (somewhere between Earth- and Super-Earth- sized) orbiting a star far enough away that it would be around Pluto's temperature if sunlight was the only heat source. If we ...
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1answer
319 views

What would weather/geographical conditions be like on a tidally locked moon?

I'm trying to figure out what weather patterns and geographical conditions would exist on a habitable moon that is tidally locked to a much larger planet/gas giant. From my research, I was able to ...
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2answers
431 views

How many Mars sized planets can form and remain stable in the habitable zone of a Sun-like star?

By Mars sized I mean with masses between 0.10 (M⊕) and 0.25 (M⊕), the planets need to have independent orbits around the star. We can assume the habitable zone stretches from 0.70 AU, to 1.5 AU for a ...
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Can a planet with 2/3 Orbital eccentricity sustain life?

On a planet where it is Earth-like, the orbit around the sun is a bit longer than 1 Earth year, and the orbit is on 2/3 eccentricity, but where only the "2" part is inside the Goldilocks zone. In ...
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Close the door on your way out - Life lit by a blue dwarf star

I'm seeking a hard science setting for a piece of xenofiction with a decidedly non-sciencey feel. That said, there is no magic or magic technology. The idea is as follows: A red dwarf star has a ...
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5answers
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''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 ...
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2answers
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What are the conditions of an Earth-like, water-ball planet?

I'd like to explore some details on a so-called water-ball planet (i.e. a planet in the habitable zone of a sun, covered by a 100 km deep ocean). I am particularly interested where life could develop ...
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415 views

Maximum amount of habitable moons possible around this Jovian planet?

The gas giant has a mass of about 2.13 Jupiter masses in the habitable zone of a Sun like star 0.981 Sol masses, all the moons will need at least >0.12 percent of Earth's mass and a Mars like density ...
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2answers
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Minimum distance a planet can remain habitable from a sun-like star?

This one source is stating a desert planet the size of Earth could maintain habitability at 0.38 AU from a sun-like star, but I highly doubt this is possible. What are some factors that could make ...
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Winds on a tidally locked moon of a gas giant

My idea has been a colonized planet or moon with incredibly strong winds so that life is only possible in deep valleys protected from the wind. I recognize that wind is primarily driven by ...
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1answer
141 views

Increased Luminosity in Stars

I'm trying to construct a solar system, and I'm toying with the idea that the planet capable of sustaining life was initially outside of the habitable zone, but the star's advanced age has caused the ...
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How could humans survive in extremely high gravity?

By extremely high gravity, I specifically mean around 28 Gs. I recently asked this question with regards to inhabiting the sun, and surviving in the sun's gravity seems like one of the major ...
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3answers
319 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 ...
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274 views

Earth Has Four Seasons Lasting Years. Is This Too Much?

In this alternate Earth, the axial tilt is still leaning to the extent of the temperate and polar zones having four seasons--spring, summer, autumn and winter. The one key difference is that each ...
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Can I build on and live on an island size tortoise?

What I am asking is not if there is an possibility of an island (Isle of Wight size because it is an island I am familiar with) size tortoise , I will find a way around that, I just want to know if a ...
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What would a binary black hole look like from the surface of a planet orbiting that system

If it is even possible, what would the Goldilocks zone be like - in fact is such a system even possible of holding life - around a binary black hole? Could it have planets orbiting it? EDIT 1: Oh ...