Questions tagged [habitable-zone]

Questions about the "Goldilocks Zone" around a parent star where conditions are just right for the potential of life developing.

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Two Suns vs Two moons in the Sky

How rare is it to have 2 stars or 2 celestial bodies at least as big as our moon and sun in the sky of a habitable planet? What are the chances of both?
Justintimeforfun's user avatar
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1 answer
661 views

Given proper temperature and luminosity, Is the Circumstellar Habitable Zone larger for larger stars?

I was seeing a size comparison video of the size of the Sun with other stars, and I could see there are stars hundreds of times larger than the Sun. I understand the Circumstellar Habitable Zone ...
Pablo's user avatar
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Could double planets in red dwarfs water-habitable zones be stable?

Red dwarfs are so dim that planets in the water habitable zone end up tidally locked to their star. Locking may good for habitability: among other advantages, no axial tilt means less swings of ...
Kevin Kostlan's user avatar
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Confusion over habitable zone

I am confused over the habitable zone, as I calculated the expected temperature of Earth (minus greenhouse effects), and it would be -17 C. Which is below the freezing point of water. I also made a ...
DanceroftheStars's user avatar
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600 views

Is Venus in our sun's habitable zone?

I know that Venus is closer to the sun than Earth and if an article I read is to be believed, Venus is hotter than Mercury even though the latter is closer to the Sun. The explanation for this odd ...
Agent Smith's user avatar
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Could a super Jovian planet have mild radiation belts?

Will a large gas giant always have powerful radiation belts or could a milder radiation environment exist even around super Jovian planets? I know Jupiter’s radiation belts are so strong due to a ...
Elhammo's user avatar
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When should we expect atmospheric info from the most promising planets for life, Trappist-1e?

It seems like other exoplanets in the Trappist-1 system have been studied by JWST but perhaps most promising planet for life, Trappist-1e, has yet to get studied or at least have any published news. ...
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What would a gas giant, such as Uranus, look like if it were orbiting a sun like star at an Earthlike orbit?

This is a hypothetical. If a gas giant with the approximate mass and density of Uranus existed within the goldilocks range to support life around a star, what would be the conditions on the service. ...
Curious Gorge's user avatar
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What stellar conditions and orbital distance are needed to produce a year length of 515 Earth days and 9 Earth hours on an Earthlike planet?

A planet has a year length of 515 Earth days and 9 Earth hours. It is the same size and has the same climate as Earth. What stellar conditions would be needed to produce this and what orbital distance ...
Galactic's user avatar
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Are main-sequence G9 stars habitable?

Our sun is a G-type main-sequence star. Specifically, it is classed as a G2 star. Meanwhile, 18.8 lightyears away, is a star called sigma draconis, or Alsafi to use its more common name. Modern ...
user98816's user avatar
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Orbital period of a planet orbiting Delta Pavonis in habitable zone

I'm continuing my inquiry about the fictional planet I have described here: https://worldbuilding.stackexchange.com/questions/231162/length-of-seasons-on-a-planet-with-eliptical-orbit. I'm now settled ...
Krišjānis Liepiņš's user avatar
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389 views

Can a tidally locked planet sustain a magnetic field

The vast majority of stars in the Galaxy, and probably the universe, are red dwarfs. The habitable zones of these stars are very close to the stars themselves, often within what would be Mercury’s ...
user98816's user avatar
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Can such planet orbit 61 Cygni A within a habitable zone?

I have developed a fictional planet I described here in Worldbuilding Stackexchange: https://worldbuilding.stackexchange.com/questions/231162/length-of-seasons-on-a-planet-with-eliptical-orbit. Since ...
Krišjānis Liepiņš's user avatar
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Were any other planets in the solar system previously habitable?

Could other planets in the solar system previously have been habitable planets such as Earth but eventually like all things died out and ceased to be viable? Could this account for the many barren ...
Diwags 's user avatar
1 vote
1 answer
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What is the evolutionary leap in the great filter? [closed]

This might be very unclear, but in pictures explaining the great filter, there is an evolutionary leap that the civilisation is most likely not to be able to pass through. But what is that leap? Is it ...
schrodingerscat's user avatar
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How would ocean tides work on a tidally-locked planet?

Since the tidal bulge is always in the same place, how would that affect ocean tides? Would they change throughout an elliptical orbit, due to changing distance from the star? How exactly would they ...
Elhammo's user avatar
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M Dwarf radiation and habitability at the terminator of a tidally-locked planet?

I know that M Dwarf stars emit intense solar flares, which is thought to pose a potential problem for the emergence of life on planets that orbit them. But I was wondering if the life that might exist ...
Elhammo's user avatar
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Could a super-Jupiter exoplanet in the habitable zone have an axial tilt?

I’m wondering if a massive planet (maybe 10 times the mass of Jupiter) in the habitable zone of a G type star could have an axial tilt similar to earth or if gravitational forces would erode the tilt ...
Elhammo's user avatar
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Is the Michael H. Hart range for the Habitable Zone (Goldlocks Zone) still used?

We're having an argument on another site about the Hart definition of the CHZ. In 1979, Hart provided a very conservative estimate of habitable zone: 0.958 - 1.004 AU. This was used to substantiate ...
Evan Carroll's user avatar
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What kinds of stars have viable habitable zones other than G-type stars, and what would life be like orbiting them? [closed]

What would foliage, landscape, and quality of life on dwarf stars and blue stars? Would it be possible for a human to live without high-tech devices and such?
Livia's user avatar
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Astrophysics Ph.D. thesis on intergalactic rogue planets and their habitability; how active is this field of research?

Is the habitability of intergalactic rogue planets something that has been studied a lot? The reason that I'm asking is that I've just started my PhD program last year and I'm wondering/concerned if ...
figureskater's user avatar
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1 answer
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could we use tidal forces H.E.P for energy on ceres asteroid [closed]

to make energy could we use the tidal forces in the water under Ceres surface?
tom's user avatar
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Brown Dwarf Sun: How dim can a star be in the visible spectrum and still provide enough heat for a planet to be habitable?

After reading this question on wordbuilding. I saw that a brown dwarf emits most of its energy in the infrared which made me wonder: How bright would such a star appear from it's exoplanet in the ...
SurpriseDog's user avatar
7 votes
1 answer
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How to calculate the goldilocks zones of brown dwarf stars? Do any encroach on the stars' Roche limit?

Ignoring tidal heating and such, how can one calculate the habitable orbital ranges for M, L, T, and Y spectral class stars? The reason I ask is that I'm also curious if any of these zones encroach ...
H2Forge's user avatar
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What are the most efficient ways to terraform Neptune's moon Triton? [closed]

I have seen on various sites and on youtube videos pertaining to the terraform of various planets and moons that are not habitable for now but they can be habitable in near future. What are the ways ...
saurabh shukla's user avatar
4 votes
1 answer
202 views

Is it dangerous to look at an L-type brown dwarf from too close?

Are some L-type brown dwarves bright enough so that it would be dangerous to the eyes if one looked at them from habitable distance or closer? If not, are the weakest M-type stars undangerous to look ...
Giovanni's user avatar
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What is the theoretical maximum variability a pulsating red giant can have such that a habitable planet can stay habitable for long periods of time?

I was reading about red giants and came across this statement: Some research suggests that, during the evolution of a 1 M☉ star along the red-giant branch, it could harbor a habitable zone for ...
WarpPrime's user avatar
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Can a supernova or a close passing star create a transient sun gravity focus "habitable zone"?

This question was inspired by the previous question Would a black hole passing next to a star create a deadly focal point due to gravitational lensing?. I understand, as gravity also acts on light, ...
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What percentage of Earth-sized planets in a habitable zone can be detected by the radial velocity method?

What percentage of Earth-sized planets in a habitable zone can be detected by the radial velocity method? I understand that larger planets and closer planets are detected more easily; and I assume ...
S. McGrew's user avatar
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1 answer
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What percentage of habitable-zone planets are detectable by transit?

I realize that the probability of detecting a planet by transit depends on the size of the star, the size of the planet's orbit, and the size of the planet; and ranges from ~10% to a small fraction of ...
S. McGrew's user avatar
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4 votes
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Why the habitable zone of a binary star is a disc and not a sphere?

I understand that the orbit of a planet will always be flat, so there is no point on making a sphere out of the HZ when we consider one star, but what about binary stars? For example, this binary ...
Carlos Vázquez Monzón's user avatar
1 vote
2 answers
628 views

Where is the habitable zone of a Hypergiant?

Where would an Earthlike planet need to be so it's still in the 'Habitable Zone' of a hypergiant Star, compared to the distance of the Earth from the sun? Could complex life develop or survive on such ...
Infinity Milestone's user avatar
7 votes
2 answers
148 views

Could a Trappist-like planetary system exist around a sun like ours?

So, a couple of years ago, the TRAPPIST sun was discovered to have 7 different earth-like planets orbiting it – three of them in the habitable zone. Nothing like this has ever been seen before, or ...
Atlan's user avatar
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Where did the idea that tidally-locked planets have a big hurricane come from?

I've been noticing a bit of a trend in the depiction of tidally-locked habitable planets, where they are shown having a huge hurricane-like storm over the daylight hemisphere. Here's an example, and ...
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How quickly can a ring system be made?

I've seen elsewhere that if a terrestrial planet had a ring system, it would be very difficult (if not impossible) for life to evolve due to the shadow the rings would cast on the temperate zone in ...
RetailPleb's user avatar
3 votes
3 answers
3k views

How far from Betelgeuse is its habitable zone?

Betelgeuse is a red supergiant or hypergiant in the constellation Orion. It is one of the biggest and brightest stars seen from the Earth, and is expected to soon go supernova. The habitable zone, or ...
Ioannes's user avatar
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Can tidally locked planets have liquid oceans on their night side, and would such a planet be habitable?

Let's say we have a tidally locked planet orbiting a star. And let's say that the conditions on its surface are just right for water to exist on its surface. Conventional wisdom says that the water on ...
Grendel-the-Hutt's user avatar
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Do secondary stars in binary systems affect how the habitable zone is calculated or they can be calculated separately?

I was taking a look at this tool to calculate habitable zones: Calculation of habitable zones which is pretty simple: you need to input Teff in Kelvins and Stellar Luminosity in solar units. Then I ...
Pablo's user avatar
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What kind of star would allow for life like our Sun/Earth and then go nova?

In the Star Trek Prime Universe, Star Trek: The Original Series, the home stars of the Fabrini, Platoans and Sarpeidons went nova, while in Star Trek: The Next Generation one of the stars in the ...
Fetter Doubt's user avatar
2 votes
2 answers
206 views

Are there any planets or objects orbiting in Goldilocks zone?

I was wondering whether there were any objects that orbit the "goldilocks zone" besides our home planet earth, and how the goldilocks zone of our solar system is defined.
roblox prisonlife's user avatar
1 vote
1 answer
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How Wide Would the Habitable Zone Be in a Singular Red Giant System?

Astrobiologists looking for signs of life outside Earth usually take excitement over planets orbiting red giant stars because a larger, brighter star usually means a farther-away but still wider ...
JohnWDailey's user avatar
2 votes
3 answers
486 views

Could a Jovian or Saturnian moon keep its atmosphere if the system was within the habitable zone?

Currently the atmosphere of Titan is 1.5x thicker than Earth's atmosphere, but it's also much much colder. It's been said that an astronomical body can keep it's atmosphere if the escape velocity is ...
SurpriseDog's user avatar
2 votes
0 answers
90 views

Are circumbinary and noncircumbinary habitable zones mutually exclusive?

Could a binary star system have an earth-like planet orbiting star A, a second earth-like planet orbiting star B, AND a third earth-like planet in a stable circumbinary orbit? Or does the space that ...
MarielS's user avatar
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1 answer
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Why the Circumstellar Habitable Zone is defined as it is, if life could be possible outside of it?

According to Circumstellar habitable zone In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a ...
Pablo's user avatar
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1 vote
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If Mercury and Venus where to collide would it make a habitable planet? [closed]

I have been wondering for a while now about a scenario of where if you combined Venus & Mercury would it be habitable if located in the goldy locks zone? I have found in my little research that ...
Kolby L's user avatar
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2 votes
2 answers
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What percentage of gas giant exoplanets are in the habitable zone?

Approximately what percent of exoplanet gas giants discovered so far are in the habitable zones of their stars? I hear that most of them are "Hot Jupiters", orbiting so close to their stars that the ...
The Literary Lord's user avatar
4 votes
2 answers
497 views

Detecting habitable planets

From my understanding we detect planets by measuring dips in light intensity from the star the habitable planet is orbiting when it passes by it. There are 2 things I don’t understand about this ...
Aaron's user avatar
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1 vote
2 answers
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Can BY Draconis variable stars sustain any form of complex life?

I wanted to ask this, because while I was working on two fictional planets back on the Worldbuilding SE, one of them being habitable, which orbit the 61 Cygni A star of the 61 Cygni binary star system,...
Future Historian's user avatar
0 votes
1 answer
226 views

Distance from the sun can equal a hospitable planet?

It is said that planets are continuously moving away from the sun. At one time Mars was just the right distance to support life at least temperature wise? Could Venus be far enough from the sun ...
Muze's user avatar
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Does habitable zone take tidally locked bodies into account?

Imagine a tidally locked planet orbiting a red dwarf, where habitability is not situated close to terminator zone, but on a "small" cap normal to incident starlight (zenith) with permanent average +15 ...
user721108's user avatar