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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2
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3answers
244 views

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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4answers
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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
295 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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2answers
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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
151 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
234 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
217 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
188 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
661 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
171 views

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
261 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
147 views

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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2answers
192 views

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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4answers
669 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 ...
8
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1answer
258 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
213 views

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 ...
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1answer
69 views

Assuming there was a spaceship that could counter-act the effects of falling into a black hole, could a human observe the hole dissipating?

The most common explanation of what would happen to a space-ship that falls into a black hole ends with spaghettification. However imagine there was a space-ship built out of unobtanium, that could ...
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11answers
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Is it worth sending a manned mission to a black hole?

Suppose we detect a stellar black hole passing near the Solar system, and we have technology and time to send a manned mission to study it. Are there any experiments or observations that would help ...
4
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2answers
369 views

Harnessing energy from a Black Hole

If a race were advanced enough to colonise space and travel between galaxies, would it be possible for them to harness a black hole in some way to generate power for the massive ships needed to ...
7
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1answer
289 views

How structurally strong would an object need to be to survive a trip through an ergosphere?

Let us assume we have a Kerr metric (rotating) black hole of 10 Sol-masses, spinning at 300 revs/s (as measured by a rest frame observer). What yield strength (assume that yield strength is limiting ...
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1answer
838 views

Is there a practical method of storing a kugelblitz?

Could a kugelblitz be stored in a container lined with metamaterials to reflect back the outpouring of hawking radiation or would it require something more exotic? Could it be pinned in the center of ...
2
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1answer
143 views

Generating power using a black hole's accretion disk?

Could you power a starship by feeding matter into a black hole and collecting the plasma produced by the tidal forces ripping apart whatever you fed it, or is this impossible/impractical? I keep ...
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4answers
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Building a Dyson Shell around a black hole?

What's the minimum safe distance to start building if you don't want any part of the shell or swarm to fall into the event horizon? Could you build a stable structure just short of the Schwarzschild ...
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1answer
285 views

What is safest distance for a dormant black hole? [closed]

Would it be safe for humanity if instead of Proxima Centauri being a red dwarf, it was a stellar mass black hole? Edit: Narrowed the question
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5answers
462 views

Travel (how far?) into the future using a black hole and light-speed space craft?

A person is traveling in a space craft that was designed and built by sufficiently advanced aliens. This space craft left from Earth and is capable of traveling infinitely close to the speed of light. ...
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13answers
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Destroy a Planet inside a black hole?

Imagine a race whom have mastered the knowledge of black holes, at least a bit. They've found a way survive, with their planet intact, inside the gravitation of the black hole without getting ...
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4answers
303 views

Does this SciFi plot about quantum singularity violate laws of physics?

I'm writing a science fiction, although I'm not from a physics background. A part of my plot is: In a futuristic Earth threatened by huge power demand and climate change, a scientist creates a ...
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5answers
202 views

What forces would make leaving a planet impossible?

My idea is to have a place that is "inescapable" by any conventional propulsion system, except it has Earth-like conditions: a breathable atmosphere, 1.0g gravity, etc. What would have to be the ...
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2answers
221 views

Could a man-made black hole deorbit the moon?

In the story I'm writing, humanity has cracked FTL travel by compressing a chunk of matter outside the craft into a short lived, gravitationally weak black hole that leads to a higher dimension (known ...
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1answer
180 views

How close would merging black holes have to be to feel gravitational waves?

Recently LIGO discovered gravitational waves caused by two black holes that were orbiting each other, and then collapsed into one black hole. A few months later, we find out that this actually happens ...
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Safe distance from a black hole?

Okay so we all know that one planet from the movie "Interstellar" that orbited the black hole Gargantua. How do I NOT get that? What's the minimum safe distance for a planet to be from a black hole ("...
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2answers
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If Earth was sucked in black hole,would it just stay there or it would be crushed by gravity pressure?

If Earth would have been sucked into black hole. Would it be crushed by gravity pressure or not?
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2answers
297 views

How to adjust our Goldilocks Zone if Nemesis turns out to be real?

I'm drafting a story where a solar system is a binary star system, except that one of its stars turns out to be a black hole with 1.5 solar mass. However, I have realized that adding a black hole ...
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3answers
475 views

How could you rapidly increase a black hole's mass?

Say you were using a black hole as a propulsion drive á la Crane and Westmoreland http://arxiv.org/pdf/0908.1803.pdf- so your black hole has a radius of around .9 attometers - super tiny - around 600,...
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2answers
216 views

How big would a wormhole have to be to allow a radio signal to pass through? [closed]

Assuming advanced alien technology to create and control wormholes, how big would a wormhole be that would allow a radio signal to pass through? Is there a way to know the size of the mouth as ...
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2answers
787 views

How massive would a black hole have to be to swallow a person

As I understand it, very small black holes have very small and close event horizons, and wouldn't necessarily pose a gravitational risk (I know they give off huge amounts of energy, but let's leave ...
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13answers
10k views

1 Light Year Diameter Planet

Suppose a species has limitless resources and the ability to construct megastructures of an astronomical scale. Would it be possible, given antigravitational technology (hypothetical), to create a ...
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13answers
4k views

How would one destroy a black hole?

Science-Fiction has tools to destroy anything: atoms, molecules, DNA, cellular organisms, multicellular organisms, buildings, streets, cities, countries, continents, planets, and even stars. Some ...
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3answers
401 views

What would getting hit by a micro black hole laser look like?

So your star and/or planet gets hit by the CrushSun. The huge laser looks terrifying, but then you realize that the main weapon is the microblack hole it hit you with. What does it look like when a ...
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1answer
371 views

How much energy does this sun crushing ship, the CrushSun, use?

Useless Backstory "Why are you waking me up Sergeant? And why did we enter near-light speed?" "We received a distress call, and there wasn't enough time to notify you, sir." "What kind of distress ...
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4answers
2k views

What would happen if the black hole at the center of a galaxy was removed?

Say you have a galaxy, possibly ours, with a central black hole. In an instant the black hole falls through a plot hole and vanishes. What happens to the rest of the galaxy? Does everything keep on ...
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1answer
299 views

How would something faster than light be affected by a black hole?

What would happen if something (having mass) existed which has a greater speed than that of light? How would it be affected by the black hole when it, say, speeds past a black hole? Would it ...
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3answers
782 views

What would happen to a planet 10x the size of Jupiter, if there was a golf ball sized black hole in its core?

What would happen to to a planet 10 times the size of Jupiter, if there was a black hole the size of a golf ball in the core of the planet? Would the planet be eaten by the black hole? Or would the ...
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2answers
327 views

How would intelligent life evolve on an Earth-like planet with dangerous high tide?

Inspired by the 2014 film Interstellar directed by Christopher Nolan, the crews landed on a planet with water flooded up to knee level. Suddenly a wall of water like mega tsunami appears from a ...
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2answers
131 views

Protocol between an information sharing black and white hole pair

Premise: Imagine a "sender" construct that has the ability to create it's own micro black hole and send information as light into it. On the receiving end, a "receiver" construct would contain it's ...
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3answers
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Could a wormhole exist on a planet?

For my story to work, my characters have to stumble across a small wormhole that actually exists on Earth and is responsible for multiple disappearances throughout history. It connects a point on ...
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3answers
453 views

How to convert a traversable wormhole into a black hole?

So the premise goes: A previously-traversable wormhole evolves into a black hole because (x) happens. What's (x)? What would it take for this to occur? Either naturally (a cosmic occurrence), by ...
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9answers
7k views

Protect a planet against a black hole attack

Suppose in a very very long future, humans have become relative powerful military force in galactic politics due to a very powerful weapon: the ability of creating black holes wherever we want. Now we ...