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 black holes be used to warp a laser transmission back to the point of origin?

I had an idea, in which humanity sends signals out (via Laser Communication), in a search for extraterrestrial life. As a result of gravitational lensing, the laser signals are eventually turned back ...
Blue Skin and Glowing Red Eyes's user avatar
7 votes
7 answers
2k views

Do (supermassive) black holes rotate? [closed]

Premise Trying to come up with a way to have a galactic unified time/date system, I turned my eye on the sidereal rotation period of, for example, the Sun, or, on the desired larger scale, Sagittarius ...
MarsMagnus's user avatar
3 votes
1 answer
444 views

Planet orbiting a star orbiting a black hole - can there be life?

Sagittarius A* is a black hole at the center of the Milky Way with at least 45 stars orbiting it. It weighs in at over 4.2 million solar masses and is likely rotating, which has interesting effects on ...
controlgroup's user avatar
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3 votes
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238 views

Elemental Foundry - Quasar powered post-ferrous material fabricator

What is this and what does it do? (this has got to play in the background) The the belief that most matter is concentrated in galaxies is false. A relatively huge portion of the matter in our universe ...
Sam Kitsune's user avatar
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5 votes
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Methods to move supermassive black holes?

There is an advanced civilization that need to move the supermassive blackholes (SMBH) of their galaxies. I have seen some similar questions on here but the ones I have read are for moving much ...
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2 votes
3 answers
843 views

Exploring a Black hole sci fi possible/not possible

I'm currently creating a universe and in that universe is the human race which has been around for about 37000 years. I am currently trying to figure out what tech they would have access to what would ...
Woli's user avatar
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4 answers
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Moving a black hole

What (if any) would be a viable option for moving a black hole with a similar mass to our moon? The black hole is not very far away (i.e disregard difficulties in reaching it). Ideally, there should ...
zevythegreat's user avatar
1 vote
2 answers
150 views

Turning a star into a black hole

**(context, skip over if you want)**Imagine a type II alien civilization that spans a large portion of its galaxy. The only reason it’s gotten this far is becuase of their aggression, but there is ...
HomegrownPotatoes's user avatar
9 votes
3 answers
1k views

How close would a black hole need to be for humans to have discovered it before theorizing it?

Black holes were first seriously theorized in the early 20th century, but it took many decades before one could be observed; depending on your definition of "observe," this may have occurred ...
Willa's user avatar
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8 votes
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How big a telescope would we need to see the light distortion effects of a black hole the mass of the Moon, at the distance of the Moon?

Fairly straightforward. I suspect that we'd notice the gravitational effects of it long before we'd be able to see it, but at what point in history would people start noticing that stars jitter around ...
Robert Rapplean's user avatar
21 votes
7 answers
8k views

The Moon turns into a black hole of the same mass -- what happens next?

If there were a black hole orbiting an inhabited planet, with the gravity of a typical moon (e.g our moon, orbiting a similarly weighted planet to ours), what practical differences would arise when ...
zevythegreat's user avatar
9 votes
5 answers
771 views

How can I hit a planet with an energy beam from ten lightyears away?

My interstellar empire is powered by a quasar. Or at least it will be once I finish my scheme. See that cloud of glowing dust? That's called the quasar's accretion disc. When stuff falls into the ...
Daron's user avatar
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6 answers
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What are the most compact batteries to store energy from my quazar power plant?

In my previous question, I dealt with the possibility of harvesting the energy of the accretion disk and jets of a quasar Milky Way, by the use of multiple mirrors and panels that are orbiting around ...
Alastor's user avatar
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1 vote
1 answer
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How much energy would a Type III civilisation get from a Quasar Milky Way per day?

Let's say, (in the far future), that humans have become really advanced beings and are at the verge of becoming a Type III civilisation. Now, they need a gargantuan energy source for various purposes, ...
Alastor's user avatar
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7 votes
3 answers
316 views

Does my concept for an "ergosphere highway" make scientific sense?

In my current science-based project, I have this idea for a string of rotating black holes (bonus points if you can figure out how they can be lined up without gravitating towards each other) that are ...
Zanly's user avatar
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Could black holes be used as a particle accelerator

I was originally was thinking of using the Jets emitted by black holes to create antimatter, however those might not fit the setting I want, due to the fact they are don't seem to occur commonly in ...
spaceamoeba1010's user avatar
1 vote
3 answers
1k views

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 ...
Alan Davies's user avatar
4 votes
1 answer
146 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 ...
Heathendom's user avatar
6 votes
3 answers
259 views

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 ...
Hanhan658's user avatar
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1 answer
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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 ...
William Salyers's user avatar
10 votes
8 answers
1k views

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 ...
Wolf Beaumont's user avatar
5 votes
4 answers
669 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 ...
user avatar
8 votes
3 answers
466 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 ...
KeizerHarm's user avatar
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4 votes
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172 views

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 ...
Adrian Colomitchi's user avatar
2 votes
2 answers
364 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 ...
user171780's user avatar
0 votes
1 answer
134 views

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 ...
Ichthys King's user avatar
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3 votes
1 answer
187 views

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-...
Logan R. Kearsley's user avatar
6 votes
3 answers
300 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 ...
JohnWDailey's user avatar
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7 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 ...
JohnWDailey's user avatar
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1 vote
2 answers
335 views

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 ...
Pycoder's user avatar
  • 37
7 votes
1 answer
387 views

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 ...
M. A. Golding's user avatar
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 ...
Nosajimiki's user avatar
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5 votes
1 answer
296 views

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 ...
Fulano's user avatar
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0 votes
0 answers
27 views

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 ...
sociocat's user avatar
  • 389
2 votes
2 answers
273 views

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 ...
sociocat's user avatar
  • 389
9 votes
2 answers
436 views

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 ...
Kristian Berry's user avatar
-2 votes
2 answers
158 views

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 ...
Fulano's user avatar
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16 votes
6 answers
2k views

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, ...
L.Dutch's user avatar
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5 votes
4 answers
594 views

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 ...
CYCLOPSCORE's user avatar
  • 2,933
1 vote
1 answer
128 views

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 ...
nomadreid's user avatar
  • 111
1 vote
3 answers
236 views

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 ...
user6760's user avatar
  • 47.8k
2 votes
1 answer
177 views

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 ...
WarpPrime's user avatar
  • 1,009
9 votes
4 answers
4k views

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 ...
user6760's user avatar
  • 47.8k
2 votes
2 answers
180 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 ...
Razmode's user avatar
  • 2,468
3 votes
2 answers
4k views

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 ...
TysonDennis's user avatar
  • 2,380
4 votes
2 answers
195 views

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 ...
CYCLOPSCORE's user avatar
  • 2,933
6 votes
2 answers
374 views

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 ...
CYCLOPSCORE's user avatar
  • 2,933
1 vote
2 answers
340 views

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 ...
CYCLOPSCORE's user avatar
  • 2,933
0 votes
2 answers
155 views

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 ...
Erik Mækir's user avatar

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