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Q&A

Posts tagged astrophysics

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Q&A How fast would strange matter conversion go?

Background: So this Kurzgesagt video talks about quark stars, and how two of them colliding could send strangelets flying towards Earth or the Sun. Now it's been said that since, theoretically (as...

1 answer  ·  posted 3y ago by Nierninwa‭  ·  last activity 2y ago by HDE 226868‭

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Q&A Do seasons occur on a tidally-locked planet?

I have done some research and so much contradict one another or I simply fail to understand. Do seasons occur on a tidally locked planet that isn't tilted on its axis?

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

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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 Superfluid lifeform

Could a life form that uses superfluids as part of its biology exist? I've read in places that the issue for life outside of Earth and especially the theorised silicon lifeforms is that the existe...

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

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Q&A How deep can the oceans be while still alowing some land?

Many alien worlds will most likely be water worlds. I was wondering what the deepest possible global ocean dept is where land is still possible. I think that volcanic islands will still have a chan...

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

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Q&A Could co-orbital planets also be double planets?

Double or binary planets are a really cool science fiction idea. A second Earth hanging ominously in the sky. Co-orbital or trojan planets are also interesting in that you have them on more or less...

2 answers  ·  posted 2y ago by Axion‭  ·  last activity 2y ago by Axion‭

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Q&A How massive would a planet need to be to sustain negligible damage from impact with the Earth?

I'm curious what factors a terrestrial planet impacting the Earth would require for the impact to cause negligible damage to the larger planet, while destroying the Earth.

6 answers  ·  posted 2y ago by Wax‭  ·  last activity 2y ago by Wax‭

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Q&A Could a hypothetically big enough planet, with an earth-like atmosphere, be big enough so that you cannot see its curvature from above?

I want to know if a planet with an atmosphere identical to that of Earth could be big enough so that from no point in the lower atmosphere it would be possible to appreciate the curvature in relati...

2 answers  ·  posted 3y ago by D3lf‭  ·  last activity 3y ago by D3lf‭

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Q&A What biological trait could make (certain members of) an insectoid species good at astronomy?

This is a science fiction intelligent alien biology question. I'm imagining a race of large (around 2m in height) insect-like species on a distant planet who discovered astronomy VERY late in thei...

12 answers  ·  posted 3y ago by Iroh‭  ·  last activity 3y ago by Iroh‭

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Q&A Using planetary/stellar media for lasing

The technical challenges for Breakthrough Starshot list the huge amount of power required for accelerating a solar sail to interstellar travel speeds and the precise targeting of laser beams of tha...

1 answer  ·  posted 3y ago by Adrian Colomitchi‭  ·  last activity 3y ago by Adrian Colomitchi‭

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Q&A How long to become a habitable planet

I am creating a world for Sci Fi story in which I am trying to have two non-tidally locked earth sized planets in a binary orbit around Alpha Centauri A. The only way I can think of this happening ...

0 answers  ·  posted 3y ago by user72655‭

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Q&A Are (near) instant data transfers feasible on an intergalactic scale?

Inspired partially by this comment on one of my answers, I got to thinking on what the quickest way to communicate would be on an intergalactic scale. Say humans have colonised the galaxy, and use...

4 answers  ·  posted 3y ago by Plutian‭  ·  last activity 3y ago by Plutian‭

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Q&A Asteroid in the asteroid belt suddenly gains the gravity of the earth

An entrepreneur has a dream. He wants to create the most amazing and magical amusement park in the solar system. He goes to investors with the blue prints of the park, and they think it's a good id...

4 answers  ·  posted 3y ago by William Oliver‭  ·  last activity 3y ago by William Oliver‭

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Q&A Orange Suns and Blue Jupiters

I am developing a fictional planetary system in which a large gas giant planet (slightly less than the mass of Saturn), has migrated into the habitable zone during the formational years of the syst...

1 answer  ·  posted 3y ago by Arkenstein XII‭  ·  last activity 3y ago by Arkenstein XII‭

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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 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 might an exoplanet have a highly radioactive atmosphere?

The exoplanet in question is Proxima Centauri b. How might the mid-to-upper-level atmosphere of that planet be dangerously radioactive and full of airborne nuclear reagents, without it being the do...

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

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Q&A Can adding mass to a ringed planet cause a huge chain reaction?

I've been wondering about this for a while. Here is the research I've done so far that lead me to ask this question: A planetary ring system is most often formed by the breakup of objects within ...

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

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Q&A How could formamide lakes form on an exoplanet?

I've been recently looking into alternative biochemistries for life and the environments were these could be found. I already asked a question about how ammonia oceans might form a while back. Toda...

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

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Q&A What would be the fate of a second satellite at the mid-point between the Earth and the Moon, with half the mass of the Moon?

If this hypothetical moon were to come to exist between the Earth and Moon, how long would it survive? And could it transition to the moon's orbit, as a subsatellite? To clairify, this scenario is...

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

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Q&A Is a Heliostationary Receiver realistic?

Advance our technology 200 years, develop very precise celestial navigation controls and very efficient nuclear reactors. Distill to ensure only the most stable elements are used in production, cos...

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

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Q&A What does and doesn't work with this planetary system around a red dwarf?

So I have the following scenario for a story, and I want to know if it runs into any ridiculous no-nos from a scientific point of view: There is an earth-like world orbiting a red dwarf (similar t...

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

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Q&A Is an earthlike planet with ammonia oceans even plausible?

The idea of a planet where ammonia replaces water as the dominant liquid in the environment is quite popular in science fiction. I tried to develop a scenario where these kind of oceans are plausib...

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

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Q&A If we were to assume the shape of planet Popstar from Kirby is kept that way artificially, how would the shape affect its day/night cycle?

Making a semi-realistic Kirby Alternate Universe (AU) here. Popstar's shape is a result of a member of this powerful race using secret magics to alter reality in this AU. What would its day/night ...

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

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Q&A How could you build an artificial planet-sized magnetic field?

I'm conceiving of a world where humans can readily terraform worlds that were once considered "dead" due to the planet's magnetic field being long gone. In such a situation, what could humans do t...

1 answer  ·  posted 3y ago by Richard Boone‭  ·  last activity 3y ago by Richard Boone‭

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Q&A Could a planet be habitable due to illumination from the galactic core?

I recently saw this answers where it was suggested that the galactic core could illuminate a planet suffiently to make sure it is always summer on one side of the planet. This got me curious and af...

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

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Q&A Moons that can't see each other

Could 2 moons that orbit same terrestrial planet never see each other if they orbit the planet at same time? Moons have different mass and gravity.

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

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Q&A What would happen if the Earth passed through an interstellar dust cloud?

I understand an interstellar dust cloud as "an accumulation of gas, plasma, and dust in our and other galaxies. Put differently, an interstellar cloud is a denser-than-average region of the interst...

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

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Q&A Can huge planets be seen from tiny planets?

Imagine a habitable, water covered, small earth-like orb in space. Let's call it P. From its surface, you see 2 large glowing masses, different sizes, in the sky, let's call them Bs. They are not s...

4 answers  ·  posted 3y ago by Bett Struble‭  ·  last activity 3y ago by Bett Struble‭

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Q&A Can early astronomers determine the gravity of their planet's "moon" without ever going there?

As I was thinking about space flight for my world, I thought about how they would need to know a planet's gravitational force before they could land, and found that humans figured out the moon's gr...

5 answers  ·  posted 3y ago by Foosic17‭  ·  last activity 3y ago by Foosic17‭

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Q&A What are the effects of a nearby supernova on a young solar system?

I'm building a S-Type binary system where the primary star is a black hole. Yet the system formed as a O + K-Spectral class binary and the 20 solar-mass O giant went nova 2,7 myr after both the sta...

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

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Q&A Rogue Planet Illuminated by Galactic Centre

The black hole question reminded me of an idea I wanted to implement at some point in a space campaign, but didn't go forward with because I was unsure whether it's merely statistically very implau...

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

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Q&A Could a planetary nebula obscure the presence of a black hole/neutron star?

I have a civilization that lives on a planet located inside a nebula (and orbiting a normal, sun-like star). Would this nebula somehow interfere with/ obscure the sight of a rogue neutron star/ b...

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

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Q&A A planet illuminated by a black hole?

Is it possible for a planet to be heated and illuminated by a black hole due to Hawking radiation at the same intensity as by a star? What mass and size should a black hole have to produce the sam...

4 answers  ·  posted 3y ago by Anixx‭  ·  last activity 3y ago by Anixx‭

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Q&A Killing a star safely

A messenger from the stars just arrived in peace but has brought horrible news. A vast swarm of planet devouring phototropic insects are approaching from deep space and our only hope is to obscure ...

20 answers  ·  posted 3y ago by Henry Taylor‭  ·  last activity 3y ago by Henry Taylor‭

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Q&A Aliens to play a mischievous space-time practical joke on Earth

Premise Suppose an earth-like world in the near-future. Then aliens come and decide to play a mischievous trick on this world on an epic scale. The goal is to disrupt Earth's time by 18 minutes. S...

13 answers  ·  posted 4y ago by Arash Howaida‭  ·  last activity 3y ago by Arash Howaida‭

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Q&A If Janus and Epimetheus had moons

Imagine a planet with two moons that have an orbital pattern similar to that of Janus and Epimetheus of Saturn... Is there a way for one of these moons to keep a stable pair of Trojan sub moons? ...

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

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Q&A Intelligent life wiped out in a binary system with a neutron star?

For the purposes of my story, I have created the following setting. An Earth-like planet orbits a binary star system made up of a Sun-like star and a neutron star. For the majority of time (hundre...

4 answers  ·  posted 3y ago by marmel‭  ·  last activity 3y ago by marmel‭

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Q&A What can my moons be made of?

So I asked a question before about having two moons. A wise patron suggested my moon be made out of something like blown glass, in order to have a big bright moon that isn't too dense. That has me ...

2 answers  ·  posted 3y ago by Bett Struble‭  ·  last activity 3y ago by Bett Struble‭

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Q&A What would be the effects on a planet orbiting a shedding red giant?

In a sci-fi RPG I eventually intend to run for a couple of friends, I had the idea of them visiting ancient ruins on a planet orbiting a shedding red giant. Now, ignoring the problem of intelligen...

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

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Q&A Could a black hole be used to lessen surface gravity on a Super-Earth?

Due to the moon's gravitational pull, objects at Earth's surface directly under the moon are slightly lighter. This tiny lessening of gravity would also take effect if the moon were on the exact op...

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

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Q&A What is the minimum size for the Sun?

How small could our Sun be and still "burn" with nuclear fusion and emit the same spectrum of light and other radiation as the real Sun does? Edit: The goal is to have a small sun inside a huge v...

2 answers  ·  posted 4y ago by System‭  ·  last activity 3y ago by System‭

Question stars astrophysics
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Q&A Could gravitational lensing be used to protect a spaceship from a laser?

Suppose Ship A is being targeted by Ship B, which intends to use a laser weapon in an attempt to destroy Ship A. Ship A has special technology that allows it to alter gravity (mainly used for gen...

5 answers  ·  posted 3y ago by Dan Petit‭  ·  last activity 3y ago by Dan Petit‭

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Q&A Building a planet with a primordial black hole core

I have been trying to figure out a way of explaining how an advanced society some time in the past built an artificial planet with a black hole at its core and the effects that would have on the pe...

1 answer  ·  posted 4y ago by Althaen‭  ·  last activity 3y ago by Althaen‭

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Q&A Determining Planet rotation period that would allow for global Wind Cell

I'm trying to figure out how quickly a planet could rotate while also having a single air flow cell, such as Hadley cells, that would circle from hot pole to cold pole, etc. as in the case of Tidal...

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

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Q&A 160 Year Solar Orbital Period & 1.9 Year Moon Orbital Period - Is it possible?

A defining factor of my world is the hardships inhabitants have to face when surviving long seasons. Due to the extreme length of a year, time is largely measured by moon cycles. I need to make sur...

5 answers  ·  posted 4y ago by DorianHuxley‭  ·  last activity 4y ago by DorianHuxley‭

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Q&A What's the biggest, most spectacular asteroid collision the moon could save us from?

An asteroid collision big enough and fast enough to see a massive ejection of rock and moon-chunks, from the surface of the earth AND not wipe out the population of the planet. What size and speed...

2 answers  ·  posted 4y ago by geekman‭  ·  last activity 4y ago by geekman‭

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Q&A Is there a plausible causal mechanism to explain why the Sun would be heating up faster/ sooner than we thought?

I am writing a novel about what it will be like on earth 500 or so years before the death of our Sun. The Sun is heating up gradually and one day that will negatively affect life on Earth. I know t...

2 answers  ·  posted 4y ago by Dan‭  ·  last activity 4y ago by Dan‭

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Q&A "Landing" a small asteroid on Earth

I've been poking around similar posts, but none seem to contain the information I'm looking for. I'll try to keep it brief. In the year 20XX, some powerful organizations are trying to "land" an as...

7 answers  ·  posted 4y ago by DMQ‭  ·  last activity 4y ago by DMQ‭