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Questions tagged [astrophysics]

For questions regarding the application of the laws of physics to orbital mechanics, stellar evolution, and other astronomical processes and celestial bodies.

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Do the physics in this hypothetical space world work? What about space travel? [closed]

Basically, I have a solar system containing roughly twenty planets (though I can do closer to 10/15, if necessary). They revolve around a giant star at the center of the world. Does this work? What if ...
bookloverKM's user avatar
5 votes
3 answers
1k views

Would mining asteroids cause meteorites

I wanted to know if the mining of Asteroids would cause a problem with meteorites for nearby planets. Like if a company came in and started blowing up moons, asteroids or dwarf planets would the ...
Tycho's user avatar
  • 155
2 votes
2 answers
127 views

Lagrange Points regarding a moon 1.5 times the mass of Earth's Moon and one 0.75 times the mass of Earth's Moon

Working on a lunar orbit system. As place holder numbers, two moons are orbiting a planet equal to earth's mass. One moon, Selenara, is 1.5 times the mass of Earth's moon, and the other, Thoth, is .75 ...
Danvad's user avatar
  • 413
3 votes
1 answer
152 views

How could you have a Super Saturn (J1407b) like planet with rings in a system with life?

I would like my world's solar system to have a super saturn (J1407b) like planet with ring system for astrological reasons. How could I have this during a "contemporary age" (Cenozoic ...
Cato's user avatar
  • 71
0 votes
0 answers
50 views

How do I find the correct planetary spacing for my red dwarf system?

I have a system with a K6.7V star at 0.585 M☉. The planetary system has 7 orbits -- A tiny, rocky planet at 0.043 AU with a mass of 0.0465 M⊕. A tidally locked, habitable, water world planet at 0.34 ...
Aster's user avatar
  • 341
8 votes
1 answer
169 views

How long would a crater/mare on the Moon be glowing red and visible from earth?

As part of the backstory of my setting, a wormhole base on the Moon catastrophically failed around 500 years ago. The energy released was enough to melt a huge portion (edit: approximately size of ...
Chromatic Realms's user avatar
7 votes
1 answer
154 views

How do Hill spheres work for binary planets?

A small moon is able to maintain a stable orbit around a planet at just under half the radius of the planet's Hill sphere. Most of Jupiter's moons are in this configuration, possibly made more stable ...
Charles Rogers's user avatar
0 votes
0 answers
42 views

Where can I find data on typical size and temperature of a star given mass and age? [duplicate]

I am building a solar system and need to investigate my options. I need data to answer questions like "if a star was X solar masses and Y million years old, how large and hot would it be?" ...
spraff's user avatar
  • 2,259
1 vote
1 answer
76 views

Post-war apocalyptic desertification scenario lasting at least 1000 years

I am writing a story, in which humanity is struggling to survive and rebuild civilisation hundreds of years after a devastating war with AIs. I'd like the world to be covered in deserts, where humans ...
Eillis's user avatar
  • 31
3 votes
1 answer
73 views

Binary Star System Physics

I am envisioning a planet that has two orbiting stars: a small yellow-white F class and a larger orange K class star. The stars were once closer and created a more tumultous tectonic history but since ...
Zip Zap's user avatar
  • 165
3 votes
2 answers
157 views

What would a beacon of light activated on Earth's surface look like from space?

Would it be physically possible to have a beacon on the Earth's surface so powerful its beam would continue outwards past the Earth, further into space, and out into the cosmos? What would that beam ...
iolim5678's user avatar
  • 185
1 vote
2 answers
248 views

I have a world with two moons, and I was wondering how often they would both be full at the same time

As I said in the title, I have a world with two moons. One has an orbital period of 17 days Earth days (Moon 1) while the other has an orbital period of 57 Earth days (Moon 2) and the planet they are ...
Jack Kibatsume's user avatar
4 votes
3 answers
548 views

I need to know day/night cyles of a moonplanet

My moon planet is the moon to a gas giant in the habital zone of its red giant star, orbiting the same distance the earth orbits the sun. It is not tidally locked, being in opposite rotation of its ...
SRL's user avatar
  • 41
16 votes
3 answers
5k views

What is the largest fraction of Earth's sky that an astronomical object could take up (visually) before ripping Earth or itself apart?

I know the Roche limit limits how close another planet could get to Earth. Closer than that limit, and either it breaks apart or Earth breaks apart. I don't care what size it is, if it's a super-...
cowlinator's user avatar
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12 votes
5 answers
7k views

The rotation of the sun's core doubles in speed every 10 years. How many years before the situation turns apocalyptical?

I'm asking this because I'm writing a fictional story where I need a doomsday scenario that means humanity must escape the earth. The timeframe that would fit the plot of the story would be in the ...
ElectronicToothpick's user avatar
8 votes
2 answers
137 views

How close to a star could a dense asteroid belt reasonably form?

I would like to have an asteroid belt "close" to a star. I want it to contain "large" asteroids. Is this plausible? I believe the location of our real life asteroid belt is ...
spraff's user avatar
  • 2,259
0 votes
1 answer
132 views

F type and K type Star Binary

I'm designing a worldbuilding project and the first major hurdle I'm encountering is the star(s) I want to have. The primary star is an F9V - F8V star with a mass of 1.13 - 1.15 Solar Masses, a radius ...
Dono's user avatar
  • 181
3 votes
1 answer
98 views

Calculating the Amount of Time for the Precession of the Equinoxes [duplicate]

OK, so in the process of building a world for my D&D campaign, I have gotten very into the science of world building. Where I have gotten hung up is I want to have a realistic length of time for ...
ZeldaChloëRose's user avatar
2 votes
1 answer
118 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 ...
Tanya's user avatar
  • 23
6 votes
7 answers
5k views

What would happen if I fire a gun in an environment with hyper-gravity?

So I've seen a lot of research done into how guns react in low gravity environments as well as on space stations. However, for my story I was wondering how the trajectory, force and speed of the ...
Tycho's user avatar
  • 155
2 votes
1 answer
756 views

Radioactive planet wrecks civilisations every 5 millennia- How stable will it be?

Backstory Okay, so for now, let's pretend the creatures on this planet are just the same as those on Earth. Humans, cattle, pets etc, are just the same, cause I haven't yet thought up the biological ...
Alastor's user avatar
  • 3,422
0 votes
2 answers
363 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 ...
Adrian's user avatar
  • 9
2 votes
1 answer
122 views

Effect of molecular clouds on space travel and civilization

To What Extent are Molecular Clouds Geographic Barriers in Space? In a sci-fi universe I've been working on for quite a while, I have different civilizations that are initially unaware of each other's ...
EldritchEntity's user avatar
4 votes
2 answers
206 views

Solar Flare/CME Range Limits

The Setting: A binary solar system comprised of a KV-class Orange Dwarf, and an M-Class Red Dwarf which orbits roughly 600AU away. The Orange Dwarf has 4 planets orbiting around it, including one ...
Atlas the Worldbuilder's user avatar
2 votes
2 answers
183 views

If Earth were located at 1.1 AU from the Sun, would this affect the two zenithal passage days in the Tropics?

I am designing calendrics for an Earth-like planet located 1.1 AU from a Sun-like star. On Earth, on April 30th and August 13th, the Sun appears to pass directly overhead between the Tropics of Cancer ...
JM Yaden's user avatar
  • 305
2 votes
2 answers
358 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 ...
Elhammo's user avatar
  • 975
-3 votes
2 answers
83 views

Could a planetary object spin at (or near )the speed of light? [closed]

And if so, what would it look like to an observer on the planet and an observer in orbit around the planet?
marmel's user avatar
  • 814
0 votes
1 answer
129 views

What would happen to an Earth-like planet if it had a more magnetically permeable inner core?

I was contemplating the impact of doping an Earth-like planet's core with a substance that alters its magnetic permeability. Specifically, I considered a scenario where the planet has an improved ...
riotopsys's user avatar
  • 101
0 votes
1 answer
165 views

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 ...
Amoeba's user avatar
  • 3,743
4 votes
3 answers
267 views

Could a slow rotating planet combined with high density atmosphere create high winds?

I am trying to design an alien ecosystem around a K type star. My idea was to have purple plants and high wind atmosphere so originally I wanted to make it tidally locked. However after watching some ...
Radu Dan Coroian's user avatar
1 vote
1 answer
230 views

How large should my supermassive planet's core be to prevent it from becoming a star?

My planet is a gas giant, it is called Klarloth (Inspired by a character from "Star Mouse" by Fredric Brown). Klarloth is a strange planet. For one thing, the planet is large in size, more ...
Alastor's user avatar
  • 3,422
8 votes
8 answers
3k views

Stopping Milkdromeda, for Aesthetic Reasons

Basically, there is a human civilization controlling the milky-way and an alien civilization controlling Andromeda. They are communicating and have decided, for some reason, that, though the ...
skout's user avatar
  • 2,058
1 vote
2 answers
481 views

Calculating distance of the frost- and ice line

To begin, my star is a K type star with 0.65 solar masses. I've inserted my star's mass in two different templates to calculate the frost line, yielding different results (2 AU and 2.68 AU). ...
Explunky's user avatar
  • 388
2 votes
1 answer
144 views

Would a planet with a retrograde spin function as if it were spinning faster or slower?

I am thinking in terms of the Coriolis Effect, atmospheric circulation and specifically Hadley Cell latitudinal width here, but the base question still stands. For ease of reference, if we take a ...
Rexotec's user avatar
  • 739
4 votes
1 answer
174 views

Exotic life in a brown dwarf

From what I have seen in the discussions here about possible life on brown dwarfs, it’s concluded that no complex chemical life (even metallic or CNT based ones) can survive the radiation and gravity ...
Fredrik Hansing's user avatar
2 votes
1 answer
68 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 ...
Galactic's user avatar
  • 4,454
3 votes
2 answers
131 views

How fast would this astronomical macromorph be?

I’m taking inspiration from Robert A. Freitas Jr.’s theory about alien metabolisms based on gravity rather than electromagnetism. He imagines astronomically sized beings that derive energy by ...
Fredrik Hansing's user avatar
2 votes
3 answers
327 views

KBC Void Stupendously Massive "Vacuum Hydrogen" generators- How to convert the Anti-Hydrogen into Hydrogen?

So, let me get this straight right here. According to Wikipedia: "The KBC Void (or Local Hole) is an immense, comparatively empty region of space,...... The underdensity is proposed to be ...
Alastor's user avatar
  • 3,422
12 votes
12 answers
4k views

Alternate universe where life is more common; is it feasible?

Let's imagine a story where the "aliens" leave a lot of super-advanced technology somewhere in the solar system. Scientists spend years excavating this technology and while it seems too ...
Mishima's user avatar
  • 1,019
5 votes
3 answers
3k views

What are the repercussions of two asteroids in the asteroid belt colliding?

As the title states, what would happen if two asteroids in the asteroid belt were to collide? Specifically, two the size of 45 Eugina impacting with each other. In my story, I am thinking about having ...
yukimoda's user avatar
  • 542
8 votes
5 answers
3k views

Practicality of building a space station in the tail of a comet

In my novel, I want to feature a large (>5km) centrifuge space station that was built on/into a comet, and is in the comet’s tail whenever it passes close to the sun. It is home to many criminal ...
Whey_Isolate's user avatar
  • 1,347
3 votes
1 answer
237 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 ...
Yulian's user avatar
  • 462
6 votes
1 answer
363 views

What dictates whether an orbit gets disrupted or stabilised due to an orbital resonance?

Context: I've got an asteroid belt analogue situated between a Gas giant and a Super-earth. I knew about resonances, so I started calculating them and placing some of them in the belt, especially ones ...
Yulian's user avatar
  • 462
2 votes
1 answer
177 views

What is the difference in speed between my two moons?

The planet in my current project is orbited by two moons, which like Mars' are relatively small and irregularly shaped. The largest moon orbits closer to the planet and the smaller one orbits farther ...
INPU's user avatar
  • 1,354
1 vote
0 answers
104 views

Jupiter's moon Europa - is it possible to colonize Europa? [closed]

So basically, I have to write a thesis paper because I'm in the last year of high school. It is an independent research project and the culminating work of my studies in school, so it represents my ...
Gabriel's user avatar
  • 11
3 votes
4 answers
595 views

Any way of having a breathable atmosphere with zero gravity in free space?(and universal directionality?)

Inspiration This is heavily inspired by sunless skies in that sunless skies' world allows for the use of steam engines as space ship- equivalent (using steam jets as thrusters, while still able to ...
Harry Mu's user avatar
  • 363
1 vote
1 answer
105 views

How would these characteristics of a habitable planet in a triple star system affect the needed aspects of having two moons?

If a habitable planet is in a hierarchical triple star system (not unlike alpha Centauri) and has two moons but has a large torrid zone, what characteristics would my moons need to have in terms of ...
Amy May San Nicolas's user avatar
6 votes
1 answer
275 views

433 Eros hits the Moon. How much rock hits the Earth?

A la this image I made. The "how" (nuclear pulse drive "adjusting" Eros's orbit at its aphelion) and "why" (uber-sized Rods from God) isn't particularly relevant — all ...
KEY_ABRADE's user avatar
  • 13.1k
2 votes
2 answers
154 views

Effects on gravity on close binary planets

Let's say there's 2 planets orbit eachother as close as possible so they're oval shaped but not close enough to reach the roche's limit and be pulled apart. How would gravity be affected on the ...
Explunky's user avatar
  • 388
20 votes
7 answers
4k views

Can I warm up outer space?

My universe was created without stars, of any kind (which includes the sun!), and has continued that way for about 2000 years. To clarify, all life (intelligent life) was created by the deities around ...
celerysticks's user avatar

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