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Just some questions out of curiosity:
1. How far is the nearest black hole to us? If it comes closer, can our Earth be swallowed?
2. Is there a minimum distance (calculated) between two black holes, for both of them to exist in a stable state?
Perhaps no definitive answers exist, but any pointers, suggestions, comments, guess-estimates are welcome.
(I don't want to use Google  )
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1) Nobody knows for sure (you can't see the buggers directly), but there is one 1600 light years away: http://www.universetoday.com/75723/where-is-the-nearest-black-hole/[^] - and they could be a lot closer. Could it swallow our earth? Oh yes. Easily, once it's tidal forces had ripped the planet to pieces and smearing out into the accretion disk.
2) Not really - the problem is that there isn't really a minimum distance on a "normal" scale as it also depends on how fast they might orbit each other, AFAIK.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Amarnath S wrote: 2. Is there a minimum distance (calculated) between two black holes, for both of them to exist in a stable state?
Infinity/Not Applicable or indeterminate.
Hawking radiation means that all BHs will eventually evaporate (although over time scales long enough that they'll be the last gasps before the heat death of the universe.
Gravitational radiation produced by the interaction of any two BHs will eventually cause them to spiral in and merge with each other (assuming they don't evaporate first). The timescale for the last of these events is also potentially as long as the heat death of the universe. The potential gotcha with this is that depending on exactly what dark energy is/how it works BHs beyond a certain distance will eventually be yanked across the horizon of each others observable universe and be unable to interact again.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, waging all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Amarnath S wrote: 1. How far is the nearest black hole to us? If it comes closer, can our Earth be swallowed?
There probably aren't any at all, so don't bother with the anti-gravity tinfoil hat.
Amarnath S wrote: 2. Is there a minimum distance (calculated) between two black holes, for both of them to exist in a stable state?
Can things that don't exist be said to have a stable state?
Amarnath S wrote: I don't want to use Google
No problem. Just install Java or Flash.
I wanna be a eunuchs developer! Pass me a bread knife!
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Don't worry about black holes instead worry about assholes. If you replace black holes with ass holes you are asking some very pertinent questions.
1. How far is the nearest black ass hole to us? If it comes closer, can our Earth be swallowed?
2. Is there a minimum distance (calculated) between two black ass holes, for both of them to exist in a stable state?
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1. Most likely is one at the center of our galaxy, so that would be about 50.000 light year if I am right.
There might more lurking closer, somewhere in the milky way but I dunno about them...
2. dunno either, but I guess 2 small blackholes could very well gravitate around each other separated only by a few hundred / thousands million kilometers... (earth is 150 million kilometers from the sun, I guess it might have to be 10 times that at least) we already detected star - black hole binary pairs, the smallest black hole being about 10 solar mass it's not that hard to imagine...
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Theoretically when you get close enough to a black hole you will be fried by radiation.
if you emit a light beam from your position to the outside, the light will be red shifted, because your time has slowed down, conversely all the incoming light will be blue shifted to ultra violet, then gamma rays.
(you will probably not see visible light pictures as far as I understood)
modified 20-Oct-19 21:02pm.
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It's kind of like software's plan, build, run
you are implementing the run phase. I primarily work in the run phase myself, both professionally and personally. Martha Stewart furniture is a prime example of what can go wrong in the build phase.
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What says it all is that that's one of their promotional pictures, but even there the doors don't line up.
I wanna be a eunuchs developer! Pass me a bread knife!
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There are only 10 types of people in the world, those who understand binary and those who don't.
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Nice find. 
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Due to circumstances beyond my control I went to Bingo with my wife last night.
I found it both stressful and boring.
But they don't half take some money.
Even the smoking area is equipped with coin slots so they can keep feeding in pounds when going outside. I wouldn't be surprised to find the stalls in the toilets had them too.
Some men are born mediocre, some men achieve mediocrity, and some men have mediocrity thrust upon them.
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Must admit I've never seen the point (and even less so for the online versions they keep pushing on the IdiotBox). My neighbour loves it though - and he's teetotal, so it isn't an acceptable way of getting bladdered either. 
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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You can tell they're making a fortune cos the food and drink was both cheap and of decent quality.
Some men are born mediocre, some men achieve mediocrity, and some men have mediocrity thrust upon them.
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If she's a teetotal she probably can't take more fun than that.
Wrong is evil and must be defeated. - Jeff Ello
Any organization is like a tree full of monkeys. The monkeys on top look down and see a tree full of smiling faces. The monkeys on the bottom look up and see nothing but assholes.
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She's a He - ex Para, likes fishing, nice guy.
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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To be fair, you aren't a lady of a certain age. My understanding of it is that they go to socialise, much like going to the pub, but crucially cheaper - an expensive session will be £10-15 but will last all evening. Of course, if you start playing the slot machines etc I image the cost will skyrocket.
Alberto Brandolini: The amount of energy necessary to refute bullshit is an order of magnitude bigger than to produce it.
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We had various vouchers because it was my wife's and her mother's birthdays last week, and it was with the two of them I went.
Her mother commented at one point about the number of people there on their own, and my wife said they go in groups, but sit alone when they play, and they also move around the hall playing at different tables to try to locate the luck.
Also I would say that there were almost as many men there as women, Jim was celebrating his 80th birthday there, very strange place.
Some men are born mediocre, some men achieve mediocrity, and some men have mediocrity thrust upon them.
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Believe it or not, this is the industry I work in. My company started 20+ years ago making bingo "computers" (just embedded systems with screens that would automatically mark bingo cards) and now it has morphed into an intranet ASP.NET system.
Yes, over here in the states, it is also skewed to older women too.
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