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Q&A

Posts tagged stars

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Q&A How can a Type II civilization influence accretion rates from a debris disk to a passing star?

A young B-type star (with a mass of about 10 M$_{\odot}$) is surrounded by a debris disk extending from about 2 AU to 1000 AU away. The disk has a mass of about 300 Earth masses - enough to form qu...

2 answers  ·  posted 7y ago by HDE 226868‭  ·  last activity 2d ago by James McLellan‭

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Q&A What stellar number density would two galaxies have to have for another star to collide with the Sun during a galactic merger?

The Milky Way and Andromeda will collide a few billion years in the future. Stellar collisions will be rare because - as Douglas Adams put it - "Space is big. Really, really big." In the galactic d...

3 answers  ·  posted 7y ago by HDE 226868‭  ·  edited 2y ago by HDE 226868‭

Question astronomy stars
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Q&A What would this nebula look like from a planet?

I have a binary system. The primary star is F- or G-class; the secondary is K-class, 20AU away, and in a small reflection nebula (suggested here). A planet orbits the primary in the habitable zon...

3 answers  ·  posted 7y ago by Monica Cellio‭  ·  edited 2y ago by Monica Cellio‭

Question stars nebula light
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Q&A How can I safely brighten my secondary star?

I have an earth-like planet orbiting one of the stars in a binary system. I have learned that, for G-class stars, if the secondary star is 100AU from the primary one, I can expect the secondary st...

5 answers  ·  posted 7y ago by Monica Cellio‭  ·  edited 2y ago by Monica Cellio‭

Question stars light
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Q&A How do seasons work in a binary system (planet orbits one star, not both)?

I have a planet orbiting one star in a binary system. When the planet is exactly between the two stars it will experience a double day; when the primary sun sets the secondary one rises, no overla...

5 answers  ·  posted 7y ago by Monica Cellio‭  ·  edited 2y ago by Monica Cellio‭

Question planets stars light
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Q&A How much does my secondary star heat the planet orbiting my primary star?

In this question I asked about the lighting patterns from this system: A really helpful answer there explained when the planet is getting how much illumination. This question is about heat. On ea...

3 answers  ·  posted 7y ago by Monica Cellio‭  ·  edited 2y ago by Monica Cellio‭

Question planets stars
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Q&A How can the Hertzsprung-Russell diagram be used in star building?

As you can probably guess from the title, I have some questions about the Hertzsprung-Russell diagram, especially how to use it to make plausible stars. Some questions: Can stars exist in the bl...

3 answers  ·  posted 4y ago by Sam Coutteau‭  ·  edited 2y ago by HDE 226868‭

Question astronomy stars
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Q&A What sets of stellar models are freely available for reference when worldbuilding?

Often, when I'm building a world, I want to start out by determining some of its key properties. Maybe I'm trying to calculate a habitable zone, or figure out how long a year would be on a particul...

0 answers  ·  posted 2y ago by HDE 226868‭  ·  last activity 2y ago by HDE 226868‭

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Q&A What would make a star good for star lifting?

My civilization is planning to being starlifting, mining a star by heating up portions of its surface and using a powerful magnetic field to channel the matter away from the star and into storage u...

4 answers  ·  posted 2y ago by HDE 226868‭  ·  last activity 2y ago by HDE 226868‭

Question stars
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Q&A I can't seem to find correct starbuilding equations that work together anywhere and am generally confused. Which ones do you use?

So far I've been using Artifexian's How To Build A Star YouTube video. The problem with this video is that it's quite old and thus outdated. The things I've noticed to be particularly weird are the...

1 answer  ·  posted 2y ago by LonelyCryptid‭  ·  last activity 2y ago by LonelyCryptid‭

Question astronomy stars
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Q&A Can the color of an alien sky be calculated solely from atmospheric composition and the star's (or stars') spectral type(s)?

What exactly are the relevant numbers for such a calculation, and can it account for the color of the sky? By sky color, I mean the day to day hue that humans (or something else with very similar ...

1 answer  ·  posted 2y ago by John O‭  ·  last activity 2y ago by John O‭

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Q&A 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 ...

3 answers  ·  posted 2y ago by Covision‭  ·  last activity 2y ago by Covision‭

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Q&A How is the visual luminosity of a star calculated?

My idea is a planet that orbits a red dwarf at a distance in which the apparent magnitude of this seen from the planet is the same as that of the sun seen from Earth. Does this mean that the daylig...

3 answers  ·  posted 3y ago by URIZEN‭  ·  last activity 3y ago by URIZEN‭

Question reality-check stars
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Q&A 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 surf...

1 answer  ·  posted 3y ago by Astrid_Redfern‭  ·  last activity 3y ago by Astrid_Redfern‭

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Q&A How would the strong magnetic field of a white dwarf affect humans inhabiting a planet that orbits such a star?

Magnetic white dwarfs (MWD) comprise almost 2 % of all white dwarfs and they are characterized by having a strong magnetic field, whose strength varies between 1 T and 100 kT. Compared to the Earth...

2 answers  ·  posted 3y ago by URIZEN‭  ·  last activity 3y ago by URIZEN‭

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Q&A How to explain a planet around a K-Type star with Orange/Red/Purple plants?

Basically, in a sci-fi roleplaying group I am apart of, I have began to work on a long-standing human colony world. The tech-level is pretty much bog-standard sci-fi, and such, colonisation is poss...

3 answers  ·  posted 3y ago by McGerridae‭  ·  last activity 3y ago by McGerridae‭

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Q&A How close must a supernova be to severely harm the Earth?

I did a little looking and it appears stars outside of 10 parsec/33 ly will have very little effect on the Earth. What it did say was that inside that range the gamma rays would affect our ozone l...

2 answers  ·  posted 8y ago by bowlturner‭  ·  last activity 3y ago by bowlturner‭

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Q&A 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 engineerin...

2 answers  ·  posted 3y ago by Astrid_Redfern‭  ·  last activity 3y ago by Astrid_Redfern‭

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Q&A Randomly generating plausible star types for a synthetic galaxy?

I'd like to randomly generate between 1 and 20 million stars for a spiral galaxy resembling our Milky Way. This is of course far fewer than our galaxy (estimated between 150 to 300 billion), but I'...

2 answers  ·  posted 3y ago by John O‭  ·  last activity 3y ago by John O‭

Question stars galactic
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Q&A In a Red Giant Binary System, How Far and How Wide Can the Habitable Zone Be?

Our estimates of our own habitable zone--a piece of space in which liquid water is possible--have varied over the years, but the current estimate is by Ramirez and Kaltenegger in 2017. Based on an ...

1 answer  ·  posted 3y ago by JohnWDailey‭  ·  last activity 3y ago by JohnWDailey‭

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Q&A Could a mass made up of certain elements or compounds "disrupt" a star?

Inspired by this interesting question-- let's say that the universe was just really, really out to get a particular star, such as our sun. Is there a perfect cocktail where a mass significantly sma...

6 answers  ·  posted 3y ago by NegativeFriction‭  ·  last activity 3y ago by NegativeFriction‭

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Q&A What size asteroid is needed to move the Sun?

What kind of asteroid would it take to hit our sun out of its current position, even by just 50 meters? And how big does it need to be in order for it to do so? Would it continue to travel throug...

9 answers  ·  posted 8y ago by Gerwin‭  ·  last activity 3y ago by Gerwin‭

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Q&A What is the most efficient way of mining energy from a flare star?

Set in the distant future, human is transitioning to a type 3 advanced civilization on a Kardashev scale in about a hundred years or two. We have nearly exhausted the energy from our Sun and severa...

3 answers  ·  posted 3y ago by user6760‭  ·  last activity 3y ago by user6760‭

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Q&A How could sentient stars work?

I'm considering making one "creature" that is encountered in a story a sentient star in an alternate universe. I hope to hand-wave a little of the more complicated stuff by saying "this universe's ...

8 answers  ·  posted 3y ago by thanby‭  ·  last activity 3y ago by thanby‭

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Q&A 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.

1 answer  ·  posted 3y ago by justthisonequestion‭  ·  last activity 3y ago by justthisonequestion‭

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Q&A Could bacteria survive on a star?

If the right requirements are met, could bacteria survive on the Sun? The bacteria would spend most of their time in hibernation and reproducing, and when the time comes, they spread out on plasma...

2 answers  ·  posted 3y ago by 2024oyefold‭  ·  last activity 3y ago by 2024oyefold‭

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Q&A How long would it take to eat the Sun?

Premise: Space lab is working on making synthetic cells out of different materials. Experiments are classified as too dangerous to be disposed of with conventional means, and are set on an collis...

2 answers  ·  posted 3y ago by Eloc‭  ·  last activity 3y ago by Eloc‭

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Q&A Is it safe to orbit HDE 226868?

I'm considering a story where an exploration is devised to explore a binary system containing a black hole; the choice is Cygnus X-1, with its companion supergiant star HDE 226868. It would likely ...

5 answers  ·  posted 6y ago by HDE 226868‭  ·  last activity 3y ago by HDE 226868‭

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Q&A 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 ...

4 answers  ·  posted 3y ago by Failus Maximus‭  ·  last activity 3y ago by Failus Maximus‭

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Q&A How much damage would a cupful of neutron star matter do to the Earth?

Suppose we used SCP-261, the vending machine that produces anything, and ask for a cup of neutron star. The machine instantaneously produces this. Suppose also that the vending machine is located ...

8 answers  ·  posted 3y ago by Quadratic Wizard‭  ·  last activity 3y ago by Quadratic Wizard‭

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Q&A How soon can the first stars form?

Introduction In our universe, the cosmic microwave background was formed approximately 400,000 years after the Big Bang. It was hot, but within a few million years after the Big Bang, it would no ...

0 answers  ·  posted 3y ago by HDE 226868‭  ·  last activity 3y ago by HDE 226868‭

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Q&A Synthesization of a star?

Would it be possible to put hydrogen into a vacuum chamber and use something to turn it into a smaller version of a star? I am making a scene with a simulated planet environment in space and wanted...

3 answers  ·  posted 3y ago by Greenie E. - Reinstate Monica‭  ·  last activity 3y ago by Greenie E. - Reinstate Monica‭

Question stars
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Q&A 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 eart...

1 answer  ·  posted 3y ago by Failus Maximus‭  ·  last activity 3y ago by Failus Maximus‭

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Q&A How much of a star can be covered in starspots?

Many stars, including the Sun, periodically display starspots, cooler areas of the surface associated with higher local concentrations of the stellar magnetic field. They can sometimes be a couple ...

1 answer  ·  posted 3y ago by HDE 226868‭  ·  last activity 3y ago by HDE 226868‭

Question stars magnetism
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Q&A Life without a bright star?

The main source of free energy that allowed life on Earth to develop was our sun. It bombards the planet's surface with photons of high energy, which provide activation energy for reactions necessa...

2 answers  ·  posted 3y ago by Franklin Pezzuti Dyer‭  ·  last activity 3y ago by Franklin Pezzuti Dyer‭

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Q&A Is there any conceivable way to "turn off" a star?

In my world, a group of "lamplighters" seek to turn off unused stars to conserve the energy for later use. This serves a few purposes, but mainly: It delays the heat-death of the Universe to some...

17 answers  ·  posted 3y ago by Nathaniel Pisarski‭  ·  last activity 3y ago by Nathaniel Pisarski‭

Question astronomy stars
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Q&A Can an Unstable Ternary Star System Last Several Hundred Years?

After reading the following question, I know that there are not that many solutions to the 3-body problem, and I know that a ternary system is unstable. The 3 stars all orbit each other in a rotati...

2 answers  ·  posted 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A 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 \...

2 answers  ·  posted 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A What could make a star green?

Stars are never green. When a star's spectra "peaks" in the green range, it also releases a significant number of waves of the adjacent colors - so "green" stars appear yellow or white. I want ...

9 answers  ·  posted 6y ago by Zxyrra‭  ·  last activity 3y ago by Zxyrra‭

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Q&A What star can give an earth-like planet a 1-day year?

I did the orbital period for a planet orbiting a mass = 1 sol with a 24-hour year, it's got a semi-major axis of 1.82 million miles - far and away beyond the Roche limit, still beyond the corona, b...

5 answers  ·  posted 3y ago by Vogon Poet‭  ·  last activity 3y ago by Vogon Poet‭

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Q&A Is a habitable planet in a sextenary star system possible?

So I want my planet to have six suns, but I'm not sure how far apart these stars would have to be from each other to not produce adverse effects on the planet that would prevent life from developin...

5 answers  ·  posted 6y ago by Z.Schroeder‭  ·  last activity 3y ago by Z.Schroeder‭

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Q&A What elements would be created in a star composed entirely of gold?

I'm working with the idea of creating a sun made out of pure gold. Of course, this would be completely man-made. Why would anyone want to do this? Because I want a cool concept like that in my stor...

8 answers  ·  posted 3y ago by overlord - Reinstate Monica‭  ·  last activity 3y ago by overlord - Reinstate Monica‭

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Q&A How to mine a star?

Things like Dyson spheres need a whole lot of raw material, which is rather difficult to come by, since the elements needed for good structural steel are scattered fairly thinly into the universe u...

3 answers  ·  posted 3y ago by Haem‭  ·  last activity 3y ago by Haem‭

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Q&A What element, if any, would justify mining stars (financially)?

Alright so in my sci-fi a prominent corporation dominated by the Borlak species (Mantis-like Hexapods). The Borlak make their money by mining "dead systems", solar systems without any habitable pla...

9 answers  ·  posted 3y ago by Celestial Dragon Emperor‭  ·  last activity 3y ago by Celestial Dragon Emperor‭

Question stars mining
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Q&A If someone dropped a black hole into the Sun, when and how will we notice it?

Suppose someone dropped a black hole into our lovely Sun a few million years ago. It was big enough (far bigger than that) from the start to eat matter faster than radiating it away, and kept growi...

1 answer  ·  posted 3y ago by Alice‭  ·  last activity 3y ago by Alice‭

Question stars black-holes
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Q&A 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 mec...

4 answers  ·  posted 8y ago by Leushenko‭  ·  last activity 3y ago by Leushenko‭

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Q&A Do stars in a binary star system fall along the ecliptic?

I am wondering about Tatooine, and was reading about binary systems here, which provided a lot of good basic food for thought. My specific question is not addressed at that link, and so I pose it h...

2 answers  ·  posted 5y ago by DPT‭  ·  last activity 3y ago by DPT‭

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Q&A Can twin stars be born?

Stars are born through the fusion of light atoms and the star's nucleus. So let's say that as a star is being born, the nucleus split and creates two stars. Could this even happen? If so, would the...

3 answers  ·  posted 6y ago by Jason Ulrich‭  ·  last activity 3y ago by Jason Ulrich‭

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Q&A Would it be possible for an Earth-like planet to have multiple moons with diverse biomes capable of supporting life?

Thanks for taking a moment to help me understand the feasibility of this scenario. Essentially, what I am looking at is an Earth-like world that would be between 1.3x and 1.6x the mass of our own ...

4 answers  ·  posted 6y ago by Varwulf‭  ·  last activity 3y ago by Varwulf‭

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Q&A What color would plants orbiting a white dwarf have?

So, let's say there's a white dwarf star that has recently been born (by recently, let's say about 3 million years ago) Now around that time, a rogue planet, about the same size and mass as earth, ...

1 answer  ·  posted 3y ago by Johnara‭  ·  last activity 3y ago by Johnara‭

Question stars flora