All Questions
199 questions
3
votes
1
answer
88
views
Tilt of the rotation axis around the barycenter in a binary planet
In the previous question I was told that in order for the double planet system not to have eclipses every day, their rotation axis tilt around the barycenter of mass must not be 90 degrees.
Both ...
- 87
3
votes
1
answer
148
views
Could you please check my calculation for a habitable binary planet system?
Good day!
For the story I have prepared information about the binary planet system.
The action will take place on the smaller (minor) of the two planets, which is supposed to be habitable.
The ...
- 87
3
votes
6
answers
1k
views
Plausible orbit to have a visible object slowly circle over the night sky
I want to have the inhabitants of a particular world - doesn't have to be a planet, can be a moon - be able to see a certain point of light - can be a planet, moon, star, whatever - moving in the sky ...
- 739
2
votes
1
answer
95
views
Two Moons Impacts On Day Length and Solar Eclipse?
(Edit: Ive decided against the idea after a conversation with a friend who knows a lot more about astrophysics, thanks for the help tho :) )
As much as I love making ecosystems on exoplanets, I cant ...
-2
votes
2
answers
112
views
Astrology while living on Mars [closed]
Astrology has been done on Earth for centuries, based on the position of the planets with respect to the constellations.
Has anyone given thought to what astrology (whether you believe in it or not) ...
- 706
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 ...
- 61
4
votes
1
answer
154
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 ...
- 81
7
votes
9
answers
3k
views
What reasons might day and night be very similar on a planet
I have a planet where I would like the distinction between night and day to be minimal. It is usually bright and it is usually hot.
The best I can come up with is a tidally locked planet, where ...
- 233
3
votes
2
answers
317
views
How do I figure out where a moon is in the sky at a given time and place?
I use this planetarium tool to see the position of the Moon to check I have it in the right place for a given place and time, for my non-Earth plant. I'm considering having another moon. How would I ...
- 53
2
votes
1
answer
129
views
At what approximate distance and what size should binary planets be for a day to be no more than 30-32 hours long?
For the story I'm trying to find a more or less plausible description of the planet.
Initially I was considering planet size like Mars or mid-size between Earth and Mars. Аnd this planet is in tidal ...
- 87
1
vote
1
answer
129
views
How deep can the oceans on my planet realistically be? [duplicate]
I want to know how deep the oceans of my super-Earth can plausibly be. Is there any way to calculate the depth of my oceans? Here are the characteristics of my planet to help with the calculations:
...
- 91
0
votes
2
answers
383
views
Implications of Venus and Mars having the same mass as Earth
Could anyone advise if there have been any simulations on the long term stability of our solar system if Venus and Mars both had the same mass as Earth ?
If not, is this something that can be answered ...
- 9
1
vote
1
answer
292
views
Can a terrestial planet have a core of metallic hydrogen?
Let's say somehow, a yellow dwarf like our sun was sent hurtling through space, and smacked into a red giant with enough force to cause the two to go supernova.
With the release of large amounts of ...
2
votes
1
answer
160
views
What's the maximum mass for an Iron Planet to have a magnetosphere like Mercury's?
I'm designing an iron planet which migrated into its habitable zone. Basic research told me iron planets cool off too quickly to have a magnetic field, so initially I was looking for ways native life ...
- 317
3
votes
2
answers
371
views
Could a captured planet end up in the habitable zone of a new star system?
Is it possible for a planet to be ejected from one star system and end up in the habitable zone of another? Or do captured planets always end up in wide, eccentric orbits?
I guess in the vast expanse ...
- 985
8
votes
1
answer
963
views
How might planet size affect volcanic activity?
I'm working on a project involving the evolution of life on different hypothetical habitable planets. In imagining different atmospheres on planets of different masses, I'm wondering how a planet's ...
- 985
14
votes
9
answers
7k
views
Is it realistic to have 7 months in a year?
I'm aware of the property of the number $2520$. It's divisible by all integer numbers from $1$ to $10$.
One of the factorizations of $2520$ is $7×360$.
It came to my mind to make a habitable planet ...
- 363
2
votes
2
answers
242
views
Is it possible for polar nights at one pole to be 8 & 1/2 months long without significantly messing up the climate?
Is it possible for polar nights at one pole to be 8 & 1/2 months long without significantly messing up the climate?
The length of polar nights at the south pole from what i know is a week longer ...
- 5,163
6
votes
6
answers
509
views
Is it possible for a planet about 1/5th larger than earth in radius to remain earthlike?
The planet in question has a radius of 7947km, volume 1.9408 times as large as earth, & a weight about 1.55377 times that of earth.
I want the planet to be earth like, or at least earth like ...
- 5,163
1
vote
2
answers
159
views
Reverse engineering the Hill Sphere?
I'm wondering if anyone has run into the issue of "I know the general idea of how big my moon is but not the parent planet" and how to sort of reverse engineer finding out the mass/radius of ...
2
votes
1
answer
99
views
What could cause a star system's protoplanetary disk to fragment more easily?
Essentially I'm looking to fill a star system with as many planetary bodies as I can, and I figure the larger the objects get, the more planets get crushed together or flung out of the system. There's ...
- 759
2
votes
1
answer
74
views
What stellar temperature, orbital distance, and eccentricity is needed to create an Earthlike orbital planet with a last glacial maximum climate?
I am creating an Earthlike planet with a year length of 515 Earth days and 9 Earth hours. I am aware that Kepler's third law of planetary motion states that warmer stars are needed for longer orbital ...
- 4,454
2
votes
2
answers
314
views
Is a p-type binary system with two suns and two moons possible? [closed]
I want to have a fantasy setting with two suns and two moons. Ideally, the stars would be 5 million km apart, orbit each other every 10 days, and pass in front of each other every 5 days, creating an ...
- 29
2
votes
3
answers
193
views
Does my binary planet make sense?
I have a binary planet as the setting for a sci-fi story, and I would like to know if this system makes sense or if there are any major flaws. I am also open to suggestions for improvements.
Here is a ...
- 29
7
votes
5
answers
515
views
How could an iron planet be geologically active?
So I have an iron planet, and its name is Randall.
Since Randall is an iron planet, he is basically the core of a planet with no crust/mantle, and very few silicates. Now, I, the creator outside of ...
- 2,197
3
votes
1
answer
242
views
How stable would partial planetary rings be on Lagrange points?
Context
There's a comparison to what I'm talking about on a larger scale: Jupiter's got its Trojans and Greeks, and Earth does have them too. Those are more or less loose and sparse groups of ...
- 460
8
votes
4
answers
282
views
In what detail can you examine a distant planet's atmosphere?
Scenario
We've got a terrestial exoplanet three times the size of Earth, 1800 light years away and with an atmosphere similar in composition to Earth's. It is determined via studies that atmosphere ...
- 460
4
votes
2
answers
196
views
What are the challenges of living on a planet with constant meteor showers?
I have been thinking of a planet that has or is experience(ing) a lunar holocaust; moon broke into pieces and many of them fell to the planet. Initial disasters probably caused a massive mass-...
- 1,216
5
votes
2
answers
302
views
Can my planet maintain a magnetic field after being tidally locked?
I'm designing an Earth-like planet that has a mass of 1.9 that of Earths' and a gravity of 1.44 g. It is orbiting around a k7v orange dwarf star at a distance of 0.47 AU and with an orbital period of ...
- 1,811
7
votes
2
answers
538
views
How much radiation would a pulsar planet receive?
I have a planet, let's call it Davy-Tim. Davy-Tim has 2 times the mass of the Earth and has a magnetic field. Davy-Tim has a negligible atmosphere and orbits an average millisecond pulsar named Dad, ...
- 2,197
1
vote
1
answer
137
views
could an equator-round elevator be possible for passing through rings of a planet to reach the moons?
I am developing a terrestrial, habitable planet with rings about the width of Uranus' rings. Not extremely thick, but still noticeable.
I have heard that rings on planets would cause an inhabitable ...
- 335
0
votes
1
answer
71
views
Can an earth-like planet exist in a circumbinary orbit around two k-class stars?While also having up to two dozen other planets in circumbinary orbit?
I have a plot arc in mind, but it all hinges on the feasibility of an earth-like world existing in circumbinary orbit around two k-class (or g-class) stars. The looming danger in the story arc is that ...
2
votes
2
answers
134
views
What color would a neptune like planet have around an orange dwarf?
Let's say we have a Neptune like planet orbiting around a k5v orange dwarf star. The planet is about as massive as Uranus but its atmosphere contains a large amount of methane. Based on what I have ...
- 1,811
2
votes
2
answers
153
views
How fast should my planet spin in order to be tidally locked?
I am designing a habitable planet with a diameter of 12.879 km. orbiting around a K5V orange dwarf star. Due to a number of planetery collisions during its creation, the planet ended up being tidally ...
- 1,811
3
votes
2
answers
146
views
Would it be realistically possible for an Earth-like planet to have a "hidden" moon?
I essentially just want the moon to always be in shadow of its planet so that from the surface of the planet it cannot be seen at any time of day - might "appear" as a black orb that blocks ...
- 115
8
votes
4
answers
851
views
Possible reasons for a planet/celestial body not tidally locked to have a region in constant darkness?
Trying to form a mostly logical basis for a world that would have one region always in darkness while also having a day-night cycle.
My first thought was to ask if a planet could have an axial tilt ...
- 115
17
votes
5
answers
3k
views
Where could we add a new planet to the inner solar system?
Assume there was a super advanced alien race that for some reason, wanted to add a new planet, of lets say 1 Earth mass, into the Solar System. Where in the inner Solar System (The part of the solar ...
- 2,197
2
votes
0
answers
86
views
Other types of planetary systems? [closed]
I recently watched Artifexian’s video about other planetary systems, and I’d like to know more about those types mentioned and if there are any additional types I should know about. (I’ve heard that ...
- 21
4
votes
1
answer
435
views
How close the the star should i place my lava planet?
I am building a solar system with a k5v star at its center. Here are the some important stats for my star:
Mass: 0.70 M
Radius: 0.67 R
Luminosity: 0.15 L
Surface gravity (log g): 4.40cgs
Temperature: ...
- 1,811
4
votes
1
answer
332
views
Can large stars have tidally locked worlds in their habitable zones?
I think the vast majority of space-enthusiasts has heard at some point that in order for a planet orbiting a red dwarf star to be habitable, it needs to be close enough to its parent star to sopport ...
- 1,811
6
votes
2
answers
315
views
How plausible is my solar system?
I am currently working on a world orbiting around a red dwarf star (M0V to M2V, I haven't decided yet) and I need some help with designing the solar system. My original plan was having 4 planets ...
- 1,811
8
votes
3
answers
433
views
How much more mass does Mars need to have in order to still be habitable today?
In an alternate timeline where Mars is the second Earth-like planet in our Solar System, the drive for colonizing it would perhaps have been much stronger. There would've been more resources spent ...
- 569
9
votes
8
answers
3k
views
Would it be possible to have 3 planets that could be colonised by humans in the same system?
I’m looking to create a situation where there are 3 habitable planets (or moons) in the same system, each with different inhospitable but habitable (by genetically modified humans or humans using ...
- 187
4
votes
1
answer
335
views
How would I calculate the greenhouse effect based on atmospheric composition?
Problem: For a known, but hypothetical planet orbiting a celestial body, how would I calculate the surface temperature after greenhouse gases?
What I know about the planet as given:
Planetary ...
- 126
3
votes
3
answers
1k
views
Could a planet without an orbiting moon still be habitable to human life in at least one small pocket? [closed]
No moon likely means no tides. Does this make a planet half water, half land, or similar divisions? Do freshwater and saltwater have separation? Or would it just be a planet like ours, with delineated ...
- 47
3
votes
1
answer
446
views
Is this a hycean world?
In the speculative astrobiology book Teeming universe by Christian Cline, there's a planet called Hurcelion. It's described as a hybrid of rocky and gas giant planets. Most of the life floats or flies ...
- 3,202
5
votes
4
answers
322
views
What would be the conditions to bring about an extremely mountainous planet
What would be the conditions of a planet for it to, over the years, form an extreme amount of mountains all across the planet. Not like a ball of spikes, just extremely mountainous.
I still want this ...
- 766
4
votes
4
answers
377
views
What are the odds of a binary solar eclipse?
I'm currently creating my own binary star system which includes a circumbinary planet that has two moons. For simplicity's sake, the stars, planet, and moons are comparable in size to our own Sun, ...
- 43
1
vote
2
answers
72
views
Life present on earth-like habitable exo-planet
Scientists are looking for an earth-like habitable exo planet. If an exo planet is earth-like (in terms of gravity, atmosphere, light, water etc.), then it must have gone through an evolution process (...
- 5,631
1
vote
1
answer
266
views
Two celestial bodies tidal locked - not with the sun [closed]
I tried to do my homework and actually thanks to this question and answer, I found myself to this site. But I just found more questions :)
Basically the setting would be close to what Earth - Moon is, ...
- 13