Questions tagged [stars]

For questions about luminous spheres of plasma held together by their own gravity, generally comprised primarily of hydrogen and helium.

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Blue star adaptation

If life did evolve on a planet around a blue star, what sort of adaptation could be expected? I so far have the autotrophs being yellow/orange or blue to absorb the light. I also thought the animal ...
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Blue star vision

For sake of argument, let's assume life did evolve on an earth like planet around a blue star. I have this idea that the animal equivalent life wouldn't have color vision so to let in less of the ...
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What evidence could reveal to aliens that their sun is the result of a binary star merger?

The answer to a previous question suggested life could have the time to begin and evolve on a planet orbiting a blue star if it was at first a binary pair that merged. The technical term is a blue ...
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color of plants from sun wavelenthg [duplicate]

So to my current knowledge a plants color is normaly the oppisite of the light it absorbs like how the plants are green on earth because it does not absorb the green wavelengths of white light.and do ...
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9 votes
8 answers
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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 ...
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7 votes
4 answers
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Could neutron star mergers provide the necessary elements for complex life in the early universe?

I have been looking into the earliest possible time in the universe that a human-like intelligent species could evolve based on the necessary elements being present. Kepler-444 is one of the oldest ...
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3 votes
1 answer
120 views

How fast would strangelets travel in space?

At what speed would strange matter travel in space after being ejected from a neutron star merger? I have searched around online but I have not found an answer.
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4 votes
2 answers
243 views

What would happen if a neutron star approached the solar system?

Given its enormous eletromagnetic field and gravity( and probably gravitational waves would be very powerful) what would happen if a neutron star approached Earth? What if approached just by few light ...
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9 votes
3 answers
939 views

Can a larger mass of stellar engines move a galaxy's dark matter?

There have been ideas about moving galaxies, if all of the needed stars and black holes become stellar/black hole engines but due to the 1:5 ratio of matter and dark matter there will not be enough ...
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0 votes
2 answers
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How bright would these four stars look on the planet you're standing on right now?

Most of the numbers here have been plugged to me by someone you would find on both Reddit and the Speculative Evolution Forum. Imagine yourself standing on a planet in a quaternary solar system. The ...
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38 votes
8 answers
4k views

What would happen to a star if most of its energy were reflected back at it?

For simplicity, lets use our Sun as the star. Next, a dyson sphere is built around it (completely enclosed solid sphere, not a dyson swarm or network, etc.). Handwave how it's built, it's not ...
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Is this scenario possible? How can it be done?-Dyson sphere replaced by gas giant star

Scenario: "...Regino is a gas giant approximately the size of Saturn, and three moons, Reo, Gei, and Tan orbit it. All three are small, rocky bodies a half to a quarter the size of Earth's moon. ...
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4 votes
2 answers
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Ways to initiate a supernova explosion

Assume we have a star that is sufficiently massive to end its life in a supernova. Also, said star is currently fusing heavy enough elements that, under normal progression, it is within less than 200 ...
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2 votes
1 answer
55 views

Solar harvesting with cycles of star lifting

I was wondering if it would be possible to take an O type star and lift material from it reducing its mass in cycles near the time the star reaches the end of its main-sequence age for each reducing ...
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10 votes
3 answers
319 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 ...
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13 votes
4 answers
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Best star for a Dyson sphere?

Whether solid or a swarm, a problem that occurs to me long-term in building a dyson structure are damaging flares and magnetic storms from the host star. It seems like the absolute best option would ...
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2 votes
0 answers
28 views

what kind of star would a planet need to sustain blue and pink flora and what effect would it have on ocean color? [duplicate]

The ecosystem on this planet, which I call Crilorix is thriving and I was hoping I can make the flora on the surface blue and pink? such as having blue leaves and pink bark on most trees and such, so ...
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5 votes
6 answers
499 views

How to Make the Two Stars of a Circumbinary System Look like One

For context: say I have a planet in a P-type orbit around a pair of binary stars. One's a K-type and the other is a red dwarf (M-type). I want it to be such that, planet-side, it looks as if there is ...
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8 votes
2 answers
350 views

Time scale and mechanism to “realistically” remove Sol from the Milky Way

What is the fastest rate a star could be flung out of our galaxy and by what mechanism(s)? (i.e. from a gravity kick by a hypothetical passing hypervelocity black hole) Secondary question: how far ...
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6 votes
3 answers
527 views

Will a Universal Ocean Prolong the Age of Stars for Eternity?

One moment, there are as much as two trillion different universes, all of which have their own collections of galaxies. The next, 4,543,000 universes still have their galaxy collections. What ...
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3 votes
2 answers
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Biblaridion's equation for making a star based off its luminosity

I have searched for at least 45 minutes and I can't seem to find it. If you don't know what I'm talking about, in Biblaridion's first Alien Biospheres Video, he mentioned the you could calculate a ...
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4 votes
2 answers
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What is the Roche Limit of a White Dwarf Compact Star?

Far, far away in the universe (specifically, 542 million kiloparsecs from here), a galaxy stands as an enduring legacy of a long-extinct hyperadvanced alien civilization, high among the Kardashev ...
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6 votes
3 answers
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What skin, hair and eye colors would people living under different stars have?

My setting includes several natural and terraformed earth-like worlds orbiting various main sequence stars, from M class dwarfs to A class giants. Humanity has independently developed from stone age ...
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2 votes
3 answers
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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. ...
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1 vote
0 answers
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In regards to mass and luminosity, what are those mystery stars?

Long ago (4.6 billion years, to be exact), a hyper-advanced alien civilization had created a solar system from scratch. Somehow, they had artificially prolonged the center of the solar system--a ...
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3 votes
2 answers
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Would a group of Dyson swarms produce a noticeable pattern in a distant night sky?

I am currently writing a scene where a person on an Earth-like planet is stargazing. This planet, an isolated agrarian world, is around twenty light years from the core of the setting's space empire, ...
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11 votes
2 answers
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Do stars work in hyperbolic space?

Any curved space is approximately Euclidean on small enough scales, so for a sufficiently large characteristic length (significantly larger than the radius of the smallest real stars) the answer is ...
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5 votes
3 answers
1k views

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?
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6 votes
3 answers
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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 ...
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3 votes
4 answers
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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 ...
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3 votes
2 answers
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Could neutron flux from a hotter primary star/keep a brown dwarf burning?

Brown dwarfs are the smallest class of star ranging from 13 to 80 times the mass of Jupiter, 0.01-0.08 solar masses; it is thought that they are stars only because fusion reactions involving hydrogen'...
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4 votes
2 answers
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Lasting spectral trace from funeral rites

So burial in space has been a thing in more sci-fi properties than I can count, and I've always wondered how long evidence of such a practice would last. In interstellar space there is little to ...
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4 votes
1 answer
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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 ...
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3 votes
2 answers
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Is it possible for a future civilization to concentrate the galaxies (or some of them) of the universe?

In the world I describe there is not much time left before the expansion of space takes its toll. Galaxies are already accelerating away from each other on a negatively curved spacetime. The expansion ...
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8 votes
2 answers
286 views

Effects of magic on stellar evolution

I believe it'd be foolish to assume that magic wouldn't affect astronomical phenomena like stellar evolution, But since I'm not smart enough to create the equations for a new fundamental force, I have ...
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6 votes
2 answers
214 views

If John Atkinson Grimshaw's Paintings were actually daylight, what kind of star would this "sun" be?

An Englishman by the name of John Atkinson Grimshaw was known only for his nocturnal paintings of the British landscape. I don't know about you, but his nocturnes have struck me as a bit...bright. ...
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0 votes
1 answer
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What Would the Sky Look Like If the Sun Were a Different Color (And Still Half a Degree Wide)? [duplicate]

This question has been asked many, many, many times--what would the sky look like if the sun were a different color? But the mistake I keep seeing is that they used actual stars and imagined Earth as ...
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3 votes
1 answer
119 views

How Much Solar Wind Does A Star Produce?

I need someone to give me a way to figure out how fast the solar wind from a star with a known mass travels, as well as how much solar wind the star releases in a given amount of time. I hope that it ...
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3 votes
2 answers
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How Would An Advanced Alien Civilization Expand the Lifespans of Giant Stars (Nearly) Exponentially? [closed]

Long ago, in some distant galaxy, an advanced civilization had turned a small, young elliptical galaxy into their own astronomical playground. They seemed to have come up with a way to prolong ...
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5 votes
2 answers
281 views

If Thorne–Żytkow Objects Exist, How Far/Wide Would Their Habitable Zones Be?

First proposed in 1977 by physicist Kim Thorne and astronomer Anna Żytkow, a...you know what? Let's just call it a TZO, sounds easier that way. Anyway, a TZO is supposedly a giant or even a ...
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2 votes
1 answer
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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 ...
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1 vote
0 answers
42 views

In this infant (<500 million years) solar system, how far would each orbit be to be stable?

Here's the story: There is a solar system that is still a baby, less than 500 million years old. There are a total of eight stars clumped into four binaries, each one with its own habitable zone. ...
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5 votes
2 answers
139 views

Maps of star clusters

Inside star clusters, there are regions where stars are within 1 light year of each other. I wish to create a sci-fi setting in one of these regions. To start, I have tried to find maps/charts of ...
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2 votes
3 answers
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Is the following plausible: a moon at an L1 point orbits a gas giant, which orbits a sun. the moon is submerged in half daylight half moonlight

I'm writing a sci-fi & fantasy novel, I won't get into details, but in essence it's set on a fantasy moon that orbits a gas giant, which orbits a sun. The moon is at an L1 (Lagrange 1) point, and ...
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2 votes
2 answers
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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) ...
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4 votes
3 answers
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Could there be a star where humans could survive for a short time?

This honestly sounds like it's basically impossible, but here we go anyway. We've picked up a strange reading from a spot orbiting a star in a system elsewhere in the Milky Way galaxy. We've come into ...
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4 votes
1 answer
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What environment do I need for gluonium entities to thrive in?

Gluons are the particles that hold quarks together. The way they do this allows them to hold each other together in the form of gluonium. Gluonium only appears at high temperatures such as those ...
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13 votes
6 answers
2k views

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 ...
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13 votes
3 answers
990 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 ...
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2 votes
1 answer
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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 ...
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