Questions tagged [black-holes]

For questions about a region of space time where gravity is so strong that nothing, not even light, can escape it.

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4answers
466 views

After surviving a black hole/wormhole, what are the chances of Earth start orbiting in a new solar system?

In the event of our sun suddenly becoming a black hole or wormhole of sorts. It transports the earth to another solar system similar to ours. Would it be possible for our planet to start circling ...
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3answers
125 views

How to tell it is a relativistic kugelblitz instead of other photonic attack?

Set in a quite distant future, intergalactic war is brewing and it is important to tell what form of attacks the enemy ship is using otherwise the battle will quickly become one sided. Anyway imagine ...
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9answers
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How to tell a blackhole from a neutron star covered entirely by Dyson sphere painted in vantablack?

In a galaxy far far away... M6760 (I made it up) is an unusually massive neutron star billions of light years away and it is surrounded by a spherical Dyson sphere painted in new improved formula ...
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4answers
244 views

What kind of matter would be needed to maintain a black hole?

Let's say we have a reactor that taps into an artificial black hole (kugelblitz-type). What kind of matter would be needed to feed the black hole to sustain it? Would this matter be treated like fuel?
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What is more “plausible” as an FTL power source?

I’d like to avoid antimatter for a specific story purpose. In that case, which is a more “plausible” way to power an FTL drive: An artificial black hole An artificial neutron star (“neutronium”) ...
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1answer
90 views

Is it possible to create a wormhole by adding density?

A black hole is an object that has infinite mass, which is thought to tear a hole in space-time fabric. Would it be possible to not have a black hole, but have an object with near-infinite density, ...
6
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2answers
204 views

Is there a safe but weird distance from black hole merger?

I wish to create a world such that it can support the following plot point: the world experiences gravitational waves that are directly noticeable to the human population (i.e. they can feel or see ...
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3answers
94 views

How much energy is produced by a sphere of mirrors around a rotating black hole? How would it impact a civilisation in the Kardashev scale?

So, as a bit of background, my world takes the assumption that Planet Nine is a rotating primordial black hole, and humanity, a Type I civilisation, is able to build a sphere of mirrors around it (...
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4answers
195 views

Is a “Partial” Black-Hole Possible?

Black holes are created by the gravitational collapse of massive stars. But in theory, black holes can also be created by any mass at all that is confined within a small enough volume of space, ...
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2answers
121 views

How do you observe black holes up close? [closed]

So in the context of sci-fi movies and video games where characters get up close and personal to the black hole without getting too close and falling into the gravity well. Is this even possible? ...
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4answers
141 views

Using a black hole/antimatter as a weapon in a fantasy story

I'm writing a fantasy set in our world but an alternate timeline where a magical force has 'leaked' into our world from an alien one. The magic is based on science in that the magic is simply energy ...
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4answers
221 views

Black Hole as a Storage Device Version 2

This is based on: Black Hole as a Storage Device What goes into a black hole doesn't come out (except as random electrons or positrons). However, is it possible to store something within the event ...
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2answers
168 views

Is it possible to build a black hole (kugelblitz) gun?

Assume that space warfare is dominated by gamma and x-ray lasers (Wakefield-Plasma and Free Electron Lasers) capable of killing targets several light-seconds away. Stealth in space is possible due to ...
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16answers
9k views

Black hole as a storage device?

I'm writing a sci-fi story, and there is a giant autonomous computer planet that constantly gathers resources from around the universe using drones. It stores a super weapon at the core of the planet, ...
5
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1answer
153 views

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 growing ...
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1answer
4k views

How do I feed my black hole?

Strange title I know, but you'll understand why quickly. I wanted to use a black hole to create absurd amounts of power for hopefully obvious reasons (kind of useful). The problem with natural large ...
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1answer
142 views

Could life exist on a planet that is heated mainly by hawking radiation from a super massive black hole that is millions of solar masses? [duplicate]

At a time long after the stelliferous there is a planet in orbit around a super massive black hole with almost all external heating coming from hawking radiation from the black hole it orbits. By ...
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1answer
104 views

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/ ...
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4answers
4k views

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 same ...
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2answers
369 views

Escaping a blackhole with an Alcubierre drive?

If your ship just got trapped inside the event horizon of an super massive black hole, could the ship "accelerate" back out with an alcubierre drive?
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6answers
4k views

How would someone destroy a black hole that’s at the centre of a planet? [duplicate]

For starters, the black hole is temporarily contained. But once it’s containment fails it will devour the planet. Obviously, that’s a bad thing. What’s a reasonable way to prevent that? Also the ...
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234 views

Schwarzschild Metric in a universe with the same space time metric as that described in the orthogonal series, but with massive gravitons?

The universe described in the orthogonal series http://www.gregegan.net/ORTHOGONAL/00/PM.html is one, in which the minus sign in the space time interval is replaced with a plus sign. So this universe ...
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2answers
331 views

Intragalactic velocity past the central black hole

In my story people are traveling from somewhere beyond the opposite side of the galaxy to Earth. The distance traveled is approximately 66 million light-years. I would like the travelers to ...
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1answer
239 views

Black hole stardrives/artificial gravity [closed]

I'm a sci-fi world builder, and I was recently reading Charles Stross's sci-fi/space opera novel Singularity Sky for inspiration, and I noticed some interesting but scientifically dubious ...
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0answers
73 views

Could you disrupt the gravity of a black hole using quadrillions of supernova explosions? [duplicate]

For context, I’m planning a novel with as much ridiculous magic as ridiculous science so, yes I know, it’s impossible but that's the fun of mixing science and magic in worldbuilding. So the situation ...
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1answer
126 views

Is there a formula for scaling explosive detonation velocity? (Supernova level) [closed]

For context, I’m planning a novel with as much ridiculous magic as ridiculous science so, yes I know, it’s impossible but bear with me. There is a supermassive black hole that weighs 1 trillion solar ...
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3answers
2k views

Black holes as heat sinks

Cooling in space is a well known difficulty. There are many unpleasant consequences like no stealth in space, difficult space battles which turn into a short wars of attrition (because you have to ...
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6answers
4k views

What would happen to a modern skyscraper if it rains micro blackholes?

Set in present day New York City, an unknown spacecraft of alien origin expelled millions of micro blackholes each with the mass of a grape in the earth atmosphere. I like to know what happens if ...
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1answer
261 views

Can the event horizon of a black hole be distorted or destabilized by an extreme spin rate

Assuming that there is a means of increasing the spin rate of an existing black hole, what would happen to the shape of the event horizon as the spin rate was increased? In extremis what would ...
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4answers
491 views

Can a single, larger black hole be split into multiple smaller black holes?

Essentially, my question is, can one larger black hole be split into a system of smaller black holes? I'm assuming energy requirements will be prohibitive, and that it may not be possible without ...
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2answers
220 views

Black hole collides with Sun: How rapidly is energy released?

Basic idea: Primordial black hole (2.5% of Sun's mass) directly approaches Sun at fairly rapid pace (300 km/s). Consequently, six days after passing Earth's orbit, it will collide with the Sun; ...
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2answers
222 views

If you open a black hole on Earth, is it escapable? [closed]

What if the Relativistic Heavy Ion Collider at Brookhaven created an unstable blackhole; could you survive this and how?
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5answers
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Could black hole civilizations even exist?

I know that currently, black hole civilizations are only theoretical. But here are my thoughts on why black hole civilizations are impossible. Black Hole Civilization Issues 1. Gravity This is an ...
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1answer
386 views

Can a black hole be turned into a white hole?

Following the Schwarzschild metric, we could consider that a white hole=black hole with no angular momentum (no spin?) or electric charge. Would be enough to slow down a black hole and somehow remove ...
6
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3answers
326 views

What would it look like in the accretion disk of a feeding supermassive black hole?

I wanted two characters unaffected by the heat and gravity to be close to a super massive black hole within the accretion disk, at times moving in orbit and at times completely still. Stars and ...
6
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2answers
610 views

How close could a planet get to a super massive black hole before being destroyed

I wanted to create a scene where two god-like characters are talking or fighting on a planet or fragment of planet to which they've teleported that's about to be obliterated by a black hole. The ...
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2answers
250 views

Can I contain and control a small black hole within a facility?

A black hole is supposed to suck in everything by nature. Micro black holes are theorized to "fizz out", so for example if one was on Earth it would not grow until Earth was consumed. It would seem ...
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3answers
236 views

What's the latest we would notice the gravitational effects of incoming super massive black hole?

Assuming we are unable to see the black hole via any way such as gravitational lensing, accretion disc or whatever. This is hand wave approach just to make my setting work, due to this answer which ...
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3answers
627 views

A supermassive black hole is coming our way. When's the latest that we would notice?

I'm trying to build a story around a supermassive black hole, which is ejected from a merger of two galaxies, that is hurtling our own way. What is the smallest realistic distance at which the black ...
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2answers
122 views

Any device to move a black hole [closed]

Our universe is quite boring area with lot of emptiness. Seems to be a huge misinvestment if the space had a price for the creator (or the causer?). There is almost no way escaping this universe with ...
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0answers
84 views

Blackhole Effects on World [closed]

An Earth-like planet orbits a Sun-like star. That whole system closely orbits a black hole, closely enough that the time shift is 100 to 1 (meaning 100 minutes pass on Earth while only 1 minute passes ...
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7answers
6k views

Is a solar system around a black hole possible?

Is it possible for there to be a "solar system" of sorts with a black hole and a few suns orbiting around it? Could that system be stable and (if so) would it be possible for some civilization(s) to ...
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2answers
370 views

Almost realistic way to beat entropy [duplicate]

Entropy will eventually mean that the universe will have send all its energy outwards in the form of light and other radiation, leaving the remaining matter in the universe cold and inert. I'm trying ...
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1answer
261 views

How close can a ship get to Sagittarius A?

Assuming that the only fancy available technology is FTL drives (to get there) plus anything needed to protect and sustain a crew during the journey from Earth to Sagittarius A (whether it takes a few ...
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4answers
542 views

Short-term Miniature black hole weapon and its effects

So in this world I'm building there's a bunch of reasons to, at some point, stop being nice and make sure someone is really, really dead. For this purpose they decided to weaponize black holes. ...
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2answers
148 views

If one traveled along a Closed Time-like Curve to arrive in a parallel universe/world-line, would the previous universe cease to exist?

This question makes several assumptions: 1) The "Many Worlds" Interpretation will have been proven through future observation 2) CTC's exist within the rotating event horizon of a Kerr black hole 3)...
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3answers
72 views

How to interface with beings in the galactic core?

Context: So assume there are an unknown number of near-omnipotent/omniscient beings who have been confirmed to live inside of an area of space called the Active Galactic Nucleus (AGN). To provide a ...
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10answers
3k views

How to build a fail-safe system for an engine that can harness energy from a Black Hole?

Some Context I'm conceiving a universe set in the far future. Humans have already mastered FTL drives and populated several planets in various star systems. They have engines based on singularities (...
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3answers
274 views

Blackholes as Perfect Recyclers or Perfect Batteries: Safe storage, recharge, and usage

Consider the facts that a blackhole: Eats everything that passes through its event horizon. In layman's terms, it is defined as the shell of "points of no return", i.e., the boundary at which the ...
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1answer
314 views

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 ...