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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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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
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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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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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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
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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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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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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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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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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
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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 ...
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3answers
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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 ...
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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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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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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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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
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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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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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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
254 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
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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
329 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
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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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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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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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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
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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 ...
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3answers
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Gravity canceling space gun vs black hole [closed]

Not sure how to say this simpler, so we'll try shorter. We have a big space gun. It makes gravity not be there where it shoots. It shoots at a black hole. Does black hole go boom? And for the ...
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3answers
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What would happen if you could remove the event horizon from Sgr A*? [closed]

There is a mind-bendingly massive black hole at the center of our galaxy, and our hyperdimensional idiot antagonist just dropped his wallet in it. He figures he'll just turn it off for a bit and fish ...
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1answer
101 views

How might a civilization artificially keep a supermassive black hole electrically charged for the lifetime of the black hole?

A civilization creates a supermassive black hole with an electric charge such that the radius of its inner horizon is 3/4 the radius of its outer horizon. In nature, a black hole with this much ...
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264 views

On an Ice Planet orbiting a Black Hole, could Jungles live in Geothermal Pockets?

The Rygyphae are a species that lives in the geothermal pockets, areas heated by volcanic activity. The rest of the planet is nothing but frozen ice and rock, but these pockets are lush jungles full ...
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3answers
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How much artificial gravity could create a black hole?

In my world, people have powers based on the four fundamental forces. One of my characters can generate spontaneous gravity to crush his opponents. He's also resistant to his own power (so I ignore ...
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7answers
789 views

Could black holes be a better source of energy than stars?

In my story, set in the far(ish) future, humanity discovers a way to extract energy from black holes (perhaps via the Penrose process?), which sparks conflict as various factions attempt to take ...
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How safe would be living in a space-time highly distorted planet

Imagine a planet - henceforth Planet X - that is orbiting very close to a black hole. The space-time distortion will be very high there and according to the theory of relativity, the time there will ...
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2answers
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Can a smaller black hole orbit a larger black hole? [closed]

Let's face it. Black holes are confusing, scary and awesome. They have defied our understanding of physics and astronomy and we still have no idea of their true nature. So can a smaller black hole ...
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1answer
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How could a Wormhole be transported?

In my universe, humanity has learned how to open wormholes for transportation, how they are opened is irrelevant and can be hand-waved, what must be kept in mind is that when they are opened, two ends ...
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6answers
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Spaceship orbiting a black hole under the event horizon - a prison where no one escapes

The relationship between the distance, $d$, of the event horizon from a black hole's center and the tidal acceleration, $a$, experienced by an object near a black hole allows for scenarios in which a ...
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The Source of Gravity Based Destruction

The Background: It's the year 4000 (or whatever), and mankind has cheated FTL travel. As a result of this 'cheating' rather than solving, however, they can't easily go beyond their borders. However,...
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Reasons for time dilation to happen on a habitable planet with same g force and not orbiting a black hole

I wish to clarify my doubts regarding time dilation Is it possible for a planet to be habitable like Edmund's planet from interstellar, which has somewhat similar gravitational force as Earth (9.8 m/...
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Could it be possible to contain an artificial singularity? [closed]

Or would it just suck in whatever was attempting to contain it? I for the life of me can't figure out an explanation for it. Could we even create a singularity in the lab or would it be too dangerous?
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The Science behind Miller's Planet

In the movie Interstellar, Miller's planet is an ocean planet orbiting extremely close to a black hole. The ridiculous tidal effects caused by the black hole cause the planet's water to concentrate ...
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1answer
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What type of black hole/rip in the universe would swallow the solar system within 1-10-100 years?

If an FTL experiment created a black hole or keugleblitz within 100 au or less of our sun, what would it's post creation statistics have to be to consume the majority of our solar system within 10 to ...
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Would it be possible to have a small black hole dissipate as it 'sinks' into the earth?

I recently watched this Kurzgesagt video exploring the question of what would happen if you had a black hole the size of a coin. To summarize the video: A black hole with the MASS of a coin would ...
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1answer
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Can we manipulate a small black hole? [closed]

Imagine lasers (not yet invented) shoot gamma rays onto one single point and creates a kugelblitz (in german lightning ball), a small black hole that can last for a year let's say. Please don't ask or ...
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Travelling through a black hole like through a wormhole?

To add to my previous question. Can a black hole be a wormhole or can a wormhole exist within a black hole? The result I want to get is this: You enter a black hole in one part of space and exit from ...
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1answer
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If a planet couldn't escape a black hole, how would it survive going through one? [closed]

In my story, earth goes through a black hole. The rest of the story is afterwards with the changes it made, an earth after a black hole. While there are a lot of potential questions and issues, the ...
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Are gamma rays always harmful?

Two days ago I asked how we can detect a (really) small black hole. The best answer (to me) was "gamma rays". Since this black hole is relatively close to our planet (a few AUs), this could be a ...
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What would an object crossing an event horizon look like to outside observers? [closed]

If something like a spaceship or a moon was falling towards a black hole and happened to cross the event horizon what would that look like to outside observers? On one hand, photons can not escape at ...
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How can we detect a small black hole?

We’re in the late 2020s and we’ve all the planned future telescopes - WFIRST, JWST, Giant Magellan Telescope etc - and technologies. There’s a small black hole in the outer solar system. It has a ...
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4answers
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Observing the age of the Universe when orbiting a black hole

Imagine a civilization developing on Planet X that is orbiting a black hole (or a similar gravitationally massive object). Given the time dilation near such a massive object, do the inhabitants of ...
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Smallest Black Hole to 'heat' a Gas Giant

So I want a large power source to heat my new real estate on the Jovian moons. I create a micro black hole (MBH), maybe a few kg, maybe more and drop it into Jupiter. I expect the following to happen [...