All Questions
145 questions
4
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138
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How would a Hot Jupiter work in a P-Type Binary System?
This is my first time using the board so sorry for any mistakes.
I am currently designing a stellar System for my fantasy world. It is a P-Type Binary system which I have based upon a modified Keplar-...
- 41
4
votes
2
answers
2k
views
Is this solar system mechanically possible?
Say, hypothetically, you have two terrestrial planets (b,c), one gas dwarf(d), and one gas giant(e) all orbit the habitable zone in some manner.
b, c, and d all have an orbital resonance, which cause ...
- 83
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
1
vote
0
answers
148
views
Astro-Mechanics: Plausibility check for binary system merge
I have a binary system composed primary about a brown dwarf and a k6.6V star that's the fusion of the system 1 and 2 7.41 billion years ago, I'll tell you the story and I'll ask the question after the ...
2
votes
2
answers
142
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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),...
- 5,163
4
votes
1
answer
99
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 ...
- 8,691
3
votes
1
answer
198
views
Could a sky be green(day)->purple(dusk)->black(night) and still be breathable?
similar requirements but green.
The reason this doesn’t answer my question is because I’d rather not have aeroplankton
Similar story with this one and I want it permanently habitable.
It takes place ...
0
votes
2
answers
112
views
Auroras of a planet around an active M7 red dwarf
A planet the size of earth around a pretty active M7 red dwarf (think of M to X level flares almost every day) has a decent magnetic field of 0.5-0.8 Gauss, orbiting at a distance of 0.0443AU, with a ...
- 154
-1
votes
1
answer
94
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Could a planet orbiting a g type main sequence star have yellow on its surface? [duplicate]
I had saw somewhere that a habitable planet orbiting a g type star same as our own could have yellow plants so could it?
0
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1
answer
165
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Looking for a Specific Planet
I know my title isn't the most specific, but the planet I am looking for is. I have been looking through many exoplanets and I can't seem to find what I am looking for, the closest I have found is ...
- 3,743
3
votes
2
answers
336
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Habitable zone of this red giant
I have a Red Giant star of about ~4.15 solar masses (a number I generated from what I found to be the average size of red giants).
My question for right now would be "What would be the habitable ...
user104078
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
1
vote
1
answer
45
views
Distances needed to make this system stable
Let's take the Trappist-1 system, and specifically, I'm thinking about the star itself and Trappist 1e because it's the most habitable of the seven planets:
Trappist 1 star is approximately 8.98% of ...
- 976
13
votes
6
answers
2k
views
Under what conditions could a gold planet form?
So, I am imagining a draconic alien species which, (don’t laugh) inhabit a planetary system that is particularly rich in heavy elements such as platinum, silver, and yes, gold. (I said don’t laugh!) ...
- 8,691
5
votes
4
answers
1k
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Could sapient life evolve in 2 billion years?
I am imagining a race of beings called Loshp, who evolved on a planet orbiting an F-type star. These stars live for only 4 billion years tops before evolving into a red giant, and half that time was ...
- 8,691
4
votes
3
answers
376
views
An Earthlike World Placed Around a Blue White Dwarf
A star that is bright, gives off blue light, and can have a world that mimics conditions on Earth is tricky. I'm hoping I can get one around a blue-colored white dwarf star.
What does the arrangement ...
- 64.4k
0
votes
1
answer
70
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 ...
4
votes
1
answer
98
views
Planet Orbital Zone and Year Length
So I'm building a fantasy world that takes place on a planet with a circumference of about 18,500 miles (it's average temperature is 40℉), and it orbits a Blue-Giant.
How long would a year be, and how ...
- 79
4
votes
1
answer
331
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
3
votes
3
answers
398
views
Selecting a Red dwarf for my planet
I am currently designing a world orbiting a red dwarf M type star and I would like to know what type of red dwarf do i need to choose (M0V - M9V stars) that can meet the requirements for my world.
For ...
- 1,811
7
votes
8
answers
2k
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Is life feasible in an inhospitable binary system?
There is a planet orbiting a binary system inside the Goldilocks zone. The problem is that the binary system is of a violent kind. It either regularly explodes and sterilizes a portion of the planet's ...
- 725
0
votes
1
answer
175
views
Various eclipses in a P-type binary star system?
Trying to make a world with a P-type binary star system, with a habitable planet orbiting around them, and one moon orbiting said planet. I am terrible with physics so I've been wondering if any of ...
- 1
1
vote
3
answers
343
views
On a Tidally-Locked Toroidal Planet
I am developing a world, and I need to see what exactly the surface would be like. It is tidally locked at 1AU away from the parent star.
It is tidally-locked via being a Torus with a major radius of ...
- 766
10
votes
8
answers
4k
views
Life underneath a blue star
Blue stars are notorious for burning too bright and living too briefly for life to develop around them. But is there some way that life could survive long enough to reach the sentience stage? I'm ...
- 3,202
10
votes
3
answers
425
views
Living around a quark star
Let's assume the theoretical quark star exists - and humans have found it. There's a planet orbiting it, and for the purposes of my story, I want it to be habitable.
My question is: Can you have a ...
- 3,709
2
votes
3
answers
239
views
can a planet be in the habitable zone of a blue star be the best option or a star that gives off more blue light
My planet originally was in a system with a blue star, but I think they are unstable and so it's not the best. So what type of stars give off more blue light in order for plants to be yellow or blue. ...
- 491
5
votes
3
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Double planet climate
How far would 2 tidally-locked (to eachother) planets need to be from their blue star host to be habitable, but have a cold-weather climate similar to our Ice Age?
- 153
10
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3
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419
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How big of a problem would UV radiation be for colonists around a main sequence blue star?
I've settled on using a blue star for my setting. It'll probably either be a small B or large A-type main sequence star, somewhere between 2 and 4 solar masses. There is one relevant planet. I've ...
- 497
4
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4
answers
2k
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Central planet in binary star system?
https://en.wikipedia.org/wiki/Habitability_of_binary_star_systems
The wikipedia article describes P-type and S-type orbits for planets in binary star systems. There are possibly some other ...
- 306k
4
votes
1
answer
197
views
How plausible is this planetary system with binary stars?
In my world, I have a binary S-type Solar System of Star-A and Star-B with these properties:
Star-A:
Luminosity: 0.86822 Sol / Mass: 0.98097 Sol / Radius: 0.91958 Sol / Radius of Hill Sphere: ~37.218 ...
- 543
2
votes
1
answer
531
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Climate of a Planet in a Binary Star System
Would the climate of a planet in a binary star system consisting of a K star and a G star be affected by the binary system? By this I mean, does having two stars at the center of a solar system affect ...
- 258
1
vote
2
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266
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Is it plausible for a planet to have a face constantly sunlit while the other is constantly moonlit, with the sun/moonlit territories never changing?
I'm writing a sci-fi & fantasy novel, I won't get into details, but in essence it's set on a fantasy planet that orbits around a sun, and has a moon. The basic premise (that I'm hoping for anyway) ...
- 33
13
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6
answers
2k
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Can a planet move itself?
Most questions in this vein seem to center around the inhabitants of a planet moving it. I have a significantly different spin on this idea, though.
So, you're a big ball of rock spinning around a ...
- 2,425
15
votes
3
answers
2k
views
What is the largest possible appearance of a celestial body in the sky?
In SciFi Art we often see planets/moons/stars fill enormous amounts of the visible sky. I'm wondering what the theoretical limit for this is realistically, since there are maxima for the possible size ...
- 3,355
2
votes
1
answer
101
views
Rocheworlds mass
Suppose you've got two tidally-locked planets, each one orbiting its own red dwarf. With two red dwarfs to hold the planets, could the planets get close enough to share atmospheres? And how would you ...
- 438
10
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2
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2k
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What would seasons and daylight be like if the Earth was on an eight-shaped orbit between two stars?
I'm building a medieval-high-fantasy world and I want it to have two suns. I'd like it to make it somewhat realistic at least as far as seasons and light/biomes go, while the actual feasibility of ...
- 4,697
13
votes
3
answers
2k
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What would a Rainbow look like on an earth-like Planet orbiting a Red Sun?
Okay, so in my setting I'm writing, the planet is very earth-like, similar atmosphere, liquid water exists, etc.. But the planet orbits a red giant. I've done a lot of fiddling around with various ...
- 149
0
votes
2
answers
172
views
Would an elecroweak star radiate similarly to a normal star? If so, would a habitable zone around it even be possible?
An electroweak star is a theoretical exotic star in which the radiation pressure from its core keeps it from collapsing into a black hole. Because of its theoretical nature, it's hard to find a lot of ...
- 19
10
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2
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351
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Could a world be dominated by white seas?
I have this idea for a world orbiting a type O star, a particularly active kind of star producing intense radiation. As a form of adaptation, the microbial life has become bright white so to reflect ...
- 3,202
6
votes
2
answers
225
views
How can I depict the stars as if looking up from a specific planet not in our solar system?
I'd like to create a realistic starscape for an extant planet, ideally with seasonal tilt change like on Earth. While I realize I can just make it up (and will probably do so if I can't figure out how ...
- 2,252
3
votes
3
answers
156
views
Would these processes be probable on this planet?
Background
This planet, located somewhere in the Andromeda galaxy, orbits a M5V star about 0.682764 AU away from its star. The planet is volcanically active due to the gravitational field of the ...
- 31
6
votes
1
answer
400
views
The Earth and Moon resolidify under a bluer star, their outer layers evaporated and burned away. What do they look like now?
(This is the third in a series of questions, starting with Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands? and How soon does the Earth's ...
- 460
8
votes
2
answers
680
views
How soon does the Earth's surface re-solidify after the red-giant Sun is replaced with a different star?
(Note: This is a follow-up question to my previous one: Moved into further orbits to protect them, how much damage do Earth and Moon take when the Sun expands?)
Thanks to clever stellar engineering ...
- 460
3
votes
1
answer
267
views
When will the last white dwarfs become black dwarfs?
I want my planet to be the last planet in a universe to host life forms. I expect a rough estimation as answer.
Thanks.
6
votes
1
answer
264
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How bright is the night with 18-22 AU distant star?
In my previous question, I asked about how close can two stars in a binary system be for planets around them to stay earthlike, assuming that both stars have very sunlike and both planets very ...
- 3,649
9
votes
4
answers
740
views
How far should second star be in my binary system?
For a certain reason, I needed two habitable similar earth-like planets very close to each other. After various information gathering, I gave up on double planet and gas giant moons, because tidal ...
- 3,649
2
votes
2
answers
233
views
What kind of star will work for my system?
After what feels like forever and after asking several questions (like this, this and this), I believe I may have decided upon a suitable orbital system for my world:
$M_{S}=2.272\;571\;144\;5 \times ...
- 6,322
10
votes
5
answers
731
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What sort of solar system / atmospheric conditions, if any, would allow for a very cold planet that still receives plenty of light from its sun?
The setting I'm interested in would involve a cold planet (cold enough for most bodies of water to be frozen - I'm thinking of an average global temperature of -20C or below). The simplest way would ...
- 497
16
votes
4
answers
2k
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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 ...
- 5,372