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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Can a Birch planet send information out?

Theoretically if a Birch planet is built around the event horizon of an ultra massive blackhole, if there was a planet or structure outside of range to experience time dilation, self maintained ...
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4 votes
1 answer
73 views

Surviving time travel using black holes or wormholes

Operating under the assumption that it is possible to use a black hole or wormhole to travel forward in time by a relatively small amount of time (e.g. 2,000 years) without travelling a significant ...
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5 votes
3 answers
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How would future galactic civilizations deal with the Big Rip? Could they escape it or hide anywhere, like inside black holes? [closed]

Humans colonized all the stars in the Milky Way in the first million years. In the next 200 million years they conquered all the planets in the Local Group. In the next few billion they conquered all ...
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How would a high escape velocity effect conditions on a low gravity Birch planet?

A birch planet is a theoretical far future Giga-structure where a shell world is built around a supermassive blackhole. I have been playing around with different astrophysical calculators to find out ...
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1 vote
3 answers
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Causing a black hole [closed]

So in my concept, humanity needs to permanently destroy an enemy planet. But their defense systems won’t allow the humans to get close enough to destroy the planet with whatever weaponry. Would it be ...
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11 votes
8 answers
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Are Black Holes Military & Economic Assets? [closed]

I'm working on a sandbox astrophysics, economics and military simulation generator (there is no defined setting but I try to use real and hypothesized science for the most part) where different types ...
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3 votes
4 answers
583 views

Aliens exist on the other side of the nearby wormhole, but we don't know wormhole exists yet. How might they be detected and communicated with?

Scenario: Humans have setup an observation/research station close enough to study the super blackhole Sagittarius A*, which in this world is a wormhole. Aliens exist on the other side. (I am flexible ...
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8 votes
3 answers
400 views

Preventing black hole formation in a water-filled universe

Imagine a universe full of water. A comfortable 22 degrees Celsius warm, density of about 998 grams per liter, and it fills up everything for as far as can be observed. There's nothing else; neither ...
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4 votes
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Gentle transformation of Moon into a black hole

I like Willk's idea of targeting something by boomerang-ing almost luminal neutrons in the gravitational field of the Moon. But that's not gonna happen without making Moon a lot denser. Question: can ...
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2 votes
2 answers
336 views

Socio-economic effects of a black hole on a civilization [closed]

Suppose a "solar system", or "black-holar system"?, in which the star is replaced by a black hole. There is no source of energy, I know, but somehow an advanced civilization ...
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0 votes
1 answer
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Could Hawking radiation illuminate an enclosed habitat?

Could visible hawking radiation be used to illuminate an enclosed space in a way that would be useful to a human? The specific space would be habitable for the human, and be close enough to the black ...
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3 votes
1 answer
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Throttling a black hole engine?

So, building artificial black holes is Really Hard. And when they get too small, they go out in a Really Big Dangerous Bang. Thus, if you manage to build, e.g., a kugelblitz factory that produces mini-...
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6 votes
3 answers
260 views

Through natural means, what could protect a rocky planet from intense x-rays from a black hole WITHOUT the expense of creating life?

I thought I had it. I thought I had finally found the solar system with enough light to produce hundreds if not thousands of Earths. I thought that a black hole 12 billion times more massive than our ...
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8 votes
2 answers
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Habitability zone around a Supermassive Black Hole

I have just found perhaps the biggest thing in the universe: A black hole named SDSS J010013.02+280225.8. It itself is 12 billion times more massive than our sun, and its accretion disk is 439 ...
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1 vote
2 answers
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How would intelligent life adapt on a black hole planet?

The world I'm building, Qi'raad, orbits a stellar-mass black hole. How would life best adapt to survive? Also, the black hole, named Halku, emits a relatively thin radio jet, which has carved a large ...
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How long could a planet or moon survive if it had an Earth mass black hole within it?

How long could a planet or moon survive if it had an Earth mass black hole within it? Hypothetical primordial black hole formed soon after the Big Bang, or low mass black holes formed later by some ...
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9 votes
4 answers
1k views

Could black holes made of matter and antimatter explode if they were to collide? [closed]

Let's say you have two same-mass black holes, about 10 solar masses each, but while one is made of pure matter, the other is made of pure antimatter. Obviously no amount of energy produced could ...
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It would be possible to enter and exit a black hole using a Warp Drive? [closed]

Well, a Warp Drive expands and contracts space, passing it through you, technically allowing faster than light travel. And so, it would be possible to actually enter a black hole and thus, exit it? I ...
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What would be the geographical effects on a map of a 1mm black hole on the earths surface for 5 seconds? [duplicate]

First of all I've read the other posts and know what the effects of a black hole appearing on the earth's surface is. It goes through the crust, the tectonic plates break apart, volcanos appear ...
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2 votes
2 answers
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What would the effects be on the surrounding landmasses if a 1mm black hole appeared on the earths surface for 5 seconds? [duplicate]

First of all I've read the other posts and know what the effects of a black hole appearing on the earth's surface is. It goes through the crust, the tectonic plates break apart, volcanos appear ...
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8 votes
2 answers
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Using transfinite numbers in a scifi story

I have been bandying about some exotic mathematics ideas as the basis for a hard scifi setting, and I wonder what technology/alien life would "make sense," here, given the physics arising ...
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-2 votes
2 answers
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Would it be possible to make a black hole using the Bose-Einstein condensate?

Well, my crazy question is whether it would be possible to make a "dyson sphere", but with the sonic black hole made with Bose-Einstein condensate (and whether it would be possible to create ...
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16 votes
6 answers
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How would a space probe determine its distance from a black hole while orbiting around it?

Let's say that a space probe is sent to swing once around a black hole. Now, as long as our knowledge of physics goes, if the spaceship stays outside the event horizon it can, at least in principle, ...
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5 votes
4 answers
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Justifying Reverse Time Dilation / Time Acceleration using White Holes

I am not sure if this should go to the Physics Stack Exchange or here, but here goes. So, I heard about the time reversed variant of black holes, known as white holes, which expel matter rather than ...
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1 vote
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energy sources for intergalactic travel in fictitious universe with similar laws of known physics but different evolution

This question differs slightly from the many excellent threads on topics similar to this one. In the fictional universe I am contemplating, the same laws of physics apply as in ours, but because of a ...
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1 vote
3 answers
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How can a civilization tell that their "Sun" is actually a black hole emitting hawking radiation?

Imagine a primordial black hole so heavy that it is a blackbody and there are many planets orbiting around it, there is a moon thriving with intelligent life orbiting a gas giant. I am wondering would ...
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2 votes
1 answer
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Could an evaporating micro-black hole serve as a useful weapon?

According to Wikipedia and Stephen Hawking's A Brief History of Time, micro-black holes are expected to evaporate quickly due to Hawking radiation, releasing a burst of final emission equivalent to ...
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9 votes
4 answers
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How do you detect and defend against micro blackhole cannon?

Set a hundred years into the future, an alien mothership antimatter engine has malfunctioned and to prevent a disaster they decided to eject the byproduct, a micro blackhole as massive as an empire ...
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2 votes
2 answers
157 views

How long would it take for a starship to escape from near the event horizon of a black hole?

An automated Spamazon delivery starship suffers a catastrophic system failure and finds itself hurtling towards a black hole on a direct collision course. In particularly dramatic fashion, it manages ...
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Black hole at the center of the planet

Okay, picture a planet so massive, a black hole has formed in its center. The minimum mass of a black hole is 22 micrograms, or the Planck mass, and whatever the core is made of, it needs to be ...
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3 votes
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Effects of Black Hole Macron Accelerators

So far, my previous Black Hole Gun has seen interesting results. However, I also thought back to the Black Hole Launcher, and how to make the Black Hole itself a "projectile". There are a ...
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6 votes
2 answers
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Effects of my Black Hole Gun

I have seen some questions in this site regarding how to weaponise black holes. One very funny one was the Black Hole Launcher, which many to quick to point out how absurd that was. However, I had ...
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1 vote
2 answers
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Would a Micro Black Hole locked in Mirror Storage have a felt weight?

I understand that Black Holes, even the small ones, are very dense and heavy. Even a micro black hole will probably weigh as much as a skyscraper, a few million tonnes. I then saw a starship ...
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0 votes
2 answers
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Would an elecroweak star radiate similarly to a normal star? If so, would a habitable zone around it even be possible?

An electroweak star is a theoretical exotic star in which the radiation pressure from its core keeps it from collapsing into a black hole. Because of its theoretical nature, it's hard to find a lot of ...
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4 votes
1 answer
326 views

Finding out the mass of a black hole for it to last ten thousand years

In my story, one of the characters essentially possesses something akin to true invulnerability and is essentially immortal due to [redacted]. In this part of the story, a group of terrorists with ...
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7 votes
1 answer
199 views

How close can I bring a beam of light to a black hole before the information the beam contains is corrupted?

Given the following conditions: Two space stations of insignificant mass (compared to what can affect the transmission of a beam of light) are separated by a distance of 100,000 light years. With ...
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4 votes
9 answers
2k views

How to annihilate an object completely? [closed]

I would like to annihilate an object (approx size of a table), in that I want to make it not exist in any recognizable form. (gamma radiation, etc. would be fine). My knowledge of physics would fit on ...
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2 votes
2 answers
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How many Ultra massive black holes should be added to a map of known black holes?

I was wondering how many Ultra-massive black holes can be added to the list of 8 known black holes with mass over 10 billion solar masses within 1 billion light years. Looking at our current maps, the ...
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2 votes
1 answer
192 views

Possible uses for time dilation in the ergosphere of a black hole?

A common use for time dilation in science fiction is for a ship moving at speeds close to the speeds of light and for those on the ship the journey takes less time than for those observing at another ...
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3 votes
1 answer
162 views

By what methods could the most energy and matter be collected from a supermassive black holes quasar jets?

I was wondering if it is possible to capture the majority of the energy and matter from the jets of a quasar from a supermassive black hole? The methods that I can think of is some sort of net like ...
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4 votes
2 answers
138 views

Is a particle beam the best method to fire a black hole at a target?

I want to weaponize black holes as projectile attacks in my story from small to supermassive and the two ways i can think of is using mass to attract mass or using matter to push it. Using a particle ...
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4 votes
1 answer
218 views

What size of black hole is the safest?

Stellar-mass black holes are obviously dangerous. Their massive gravitational field and tidal forces threaten any planet or star system that gets too close to them. Microscopic black holes are also ...
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6 votes
1 answer
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What happens if I shot a blackhole pellet point blank at someone?

Imagine I had a sophisticated gun that is capable of producing a micro blackhole on contact with a target, that blackhole is designed to be completely evaporated as hawking radiation in exactly 1 ...
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6 votes
3 answers
198 views

Black holes: Can something that has fallen through the even horizon be recovered if the black hole evaporates quickly enough?

From puppetsock's reply to Is it possible to build a black hole (kugelblitz) gun?, it seems like a black hole of 228 tonnes evaporate after just 1 second. And the lifetime of a black hole in general ...
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3 votes
2 answers
184 views

How movable are miniature black holes?

I've purchased a miniature black hole on ebay. I've heard they make excellent kitchen disposal units. Unfortunately the seller says it is for collection only. Will I be able to move it? Anti-gravity ...
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4 votes
1 answer
238 views

What to do with planet nine if it is a Black Hole? [closed]

Recently it's been theorized that "planet nine" may be a black hole. If this was the case what could we do with it? What unresolved problems in physics could be solved by having such a thing ...
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0 votes
1 answer
194 views

What can happen in a non-deterministic world? [closed]

I was reading about a theoretical charged Black Hole known as the Reissner Nördstrom Black Hole, where should someone enter its Cauchy Horizon, will end up in a world not bound by determinism. What ...
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6 votes
2 answers
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What's the Use of a Susskind Hologram?

(this question may need to go to sandbox for refining) Leonard Susskind proposed that the surface of a black hole might be kind-of recording device for everything falling into it. Where 3D of space + ...
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2 votes
3 answers
240 views

Can a galaxy be formed from a black hole?

I'm writing creative text and I'm curious to know, just as possibility, can a galaxy by any chance be formed out of a black hole?
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2 votes
2 answers
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Could aliens from beyond the singularity of a rotating black hole survive and colonise regions of a normal universe?

Would it be possible for aliens that originated and evolved in a planetary system beyond the ring singularity of a rotating black hole to send individuals out into a normal universe to colonise it? Or ...
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