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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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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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7answers
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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
167 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
192 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
193 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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111 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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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
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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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3answers
232 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
128 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 ...
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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
995 views

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
95 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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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
657 views

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
576 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 ...
4
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1answer
162 views

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
148 views

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
152 views

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
609 views

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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7answers
385 views

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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3answers
159 views

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
121 views

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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1answer
266 views

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
97 views

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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2answers
176 views

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
137 views

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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5answers
494 views

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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3answers
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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
286 views

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 [...
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1answer
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Dropping a Micro Black Hole into a Gas Giant [duplicate]

Update: Joe Kissling raised some important objections in the comments - I'll play about a bit with black hole masses and update my question accordingly - any answer along similar lines might be ...
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1answer
144 views

What will happen to an object placed between two portals facing each other

Here's the deal: There are actually four portals. Two of them facing to a black hole and their linked portals are facing each other In image BH is black hole P1 is portal number one similarly P2,P3,...
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1answer
203 views

Black hole in ice-cream truck? [closed]

In my book I have a genius ice-cream truck driver who harnesses the power of a black hole by storing in his ice-cream truck. Here is how he should be able to do it: first he has found a way to ...
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1answer
188 views

Can matter be super-compressed by a magnetic field

So I had this idea for an FTL drive that would work by creating a rift (a black hole before it tugs on space enough to become unstable and deadly) via an unbelievably strong magnetic field. I know ...
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1answer
178 views

Escaping a pair of orbiting black holes through the saddle

Imagine a pair of black holes in orbit around each other. I'm wondering how this would distort their mutual event horizons. In fact would it be possible to "break" the event horizons by reducing the ...
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1answer
548 views

What exactly would happen if a black hole was introduced into the sun?

A ship powered by a black hole of a few hundred thousand tons (say, under $6 \times10^8$ kg, which would have a lifetime of several years and a power output of a few hundred petawatts) crashes (...
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3answers
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How can black holes be used for daredevil gravity slingshot sport?

This is set in the same universe as my Andromeda galactic war question (same tech level). In this question, I had somewhat purposely labelled the galactic core as "off-limits" (black holes and other ...
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4answers
253 views

Could you 'deconstruct' a blackhole by firing heavy metals into its orbit?

Using the process of 'pair production' and using the nature of a blackhole to separate and destroy one of the particles from that pair, would surrounding blackholes with heavy metals (which increase ...
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1answer
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Effects of closing a Black Hole in a solar system (let's say ours?) [closed]

Lets say for instance an alien civilization decided to drop an artificial star on the edge of our solar system's Heliosphere, resize it 20x the size of ours, implode it into a black hole but omit the ...
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4answers
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Is it safe to orbit HDE 226868?

I'm considering a story where an exploration is devised to explore a binary system containing a black hole; the choice is Cygnus X-1, with its companion supergiant star HDE 226868. It would likely be ...
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What if a molecule turned into a black hole? [closed]

Could it turn into the size of a quark? Could there be a quark-sized black hole?
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457 views

Life on planets near quasars

To be very-very simple: The very main setting of my world is a very special and very small galaxy, the galactic core of which is a quasar - with the "iconic" light beam in the middle, serving a ...
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1answer
206 views

What density can I set for Uium, to be reshaped by moon-mass black/white holes

How do you cut through an unbreakable armor? With an all-powerful sword, of course. No really, if we had seemingly unbreakable matter (lets give it the original name of Unobtadamentium, or Uium for ...
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3answers
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Seeing Using Gravitational Waves [duplicate]

I know that humans' eyes are adapted to detect some electromagnetic waves, and their ears are able to detect sound waves. What I would like to ask is: Is it plausible for a species to biologically ...