blackholes?

Question

can a black hole suck in something larger than itself & what happens to an object after it gets sucked in to one- is it completely obliterated,sucked into void,transported?Can a black hole be so large it can take in a whole solar system or even something bigger?will our sun collapse anytime soon?can a blackhole suck in another blackhole? soooooo many questions,so little time.

Answer 1

Yes. They suck but not like you think. Black wholes have sooo much mass that they have vast inertia and are not attracted to much. All is attracted to them. All matter in a black whole is condensed mater

What would happen to me if I fell into a black hole?
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Let's suppose that you get into your spaceship and point it straight towards the million-solar-mass black hole in the center of our galaxy. (Actually, there's some debate about whether our galaxy contains a central black hole, but let's assume it does for the moment.) Starting from a long way away from the black hole, you just turn off your rockets and coast in. What happens?

At first, you don't feel any gravitational forces at all. Since you're in free fall, every part of your body and your spaceship is being pulled in the same way, and so you feel weightless. (This is exactly the same thing that happens to astronauts in Earth orbit: even though both astronauts and space shuttle are being pulled by the Earth's gravity, they don't feel any gravitational force because everything is being pulled in exactly the same way.) As you get closer and closer to the center of the hole, though, you start to feel "tidal" gravitational forces. Imagine that your feet are closer to the center than your head. The gravitational pull gets stronger as you get closer to the center of the hole, so your feet feel a stronger pull than your head does. As a result you feel "stretched." (This force is called a tidal force because it is exactly like the forces that cause tides on earth.) These tidal forces get more and more intense as you get closer to the center, and eventually they will rip you apart.

For a very large black hole like the one you're falling into, the tidal forces are not really noticeable until you get within about 600,000 kilometers of the center. Note that this is after you've crossed the horizon. If you were falling into a smaller black hole, say one that weighed as much as the Sun, tidal forces would start to make you quite uncomfortable when you were about 6000 kilometers away from the center, and you would have been torn apart by them long before you crossed the horizon. (That's why we decided to let you jump into a big black hole instead of a small one: we wanted you to survive at least until you got inside.)

What do you see as you are falling in? Surprisingly, you don't necessarily see anything particularly interesting. Images of faraway objects may be distorted in strange ways, since the black hole's gravity bends light, but that's about it. In particular, nothing special happens at the moment when you cross the horizon. Even after you've crossed the horizon, you can still see things on the outside: after all, the light from the things on the outside can still reach you. No one on the outside can see you, of course, since the light from you can't escape past the horizon.

How long does the whole process take? Well, of course, it depends on how far away you start from. Let's say you start at rest from a point whose distance from the singularity is ten times the black hole's radius. Then for a million-solar-mass black hole, it takes you about 8 minutes to reach the horizon. Once you've gotten that far, it takes you only another seven seconds to hit the singularity. By the way, this time scales with the size of the black hole, so if you'd jumped into a smaller black hole, your time of death would be that much sooner.

Once you've crossed the horizon, in your remaining seven seconds, you might panic and start to fire your rockets in a desperate attempt to avoid the singularity. Unfortunately, it's hopeless, since the singularity lies in your future, and there's no way to avoid your future. In fact, the harder you fire your rockets, the sooner you hit the singularity. It's best just to sit back and enjoy the ride.

My friend Penelope is sitting still at a safe distance, watching me fall into the black hole. What does she see?
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Penelope sees things quite differently from you. As you get closer and closer to the horizon, she sees you move more and more slowly. In fact, no matter how long she waits, she will never quite see you reach the horizon.

In fact, more or less the same thing can be said about the material that formed the black hole in the first place. Suppose that the black hole formed from a collapsing star. As the material that is to form the black hole collapses, Penelope sees it get smaller and smaller, approaching but never quite reaching its Schwarzschild radius. This is why black holes were originally called frozen stars: because they seem to 'freeze' at a size just slightly bigger than the Schwarzschild radius.

Why does she see things this way? The best way to think about it is that it's really just an optical illusion. It doesn't really take an infinite amount of time for the black hole to form, and it doesn't really take an infinite amount of time for you to cross the horizon. (If you don't believe me, just try jumping in! You'll be across the horizon in eight minutes, and crushed to death mere seconds later.) As you get closer and closer to the horizon, the light that you're emitting takes longer and longer to climb back out to reach Penelope. In fact, the radiation you emit right as you cross the horizon will hover right there at the horizon forever and never reach her. You've long since passed through the horizon, but the light signal telling her that won't reach her for an infinitely long time.

There is another way to look at this whole business. In a sense, time really does pass more slowly near the horizon than it does far away. Suppose you take your spaceship and ride down to a point just outside the horizon, and then just hover there for a while (burning enormous amounts of fuel to keep yourself from falling in). Then you fly back out and rejoin Penelope. You will find that she has aged much more than you during the whole process; time passed more slowly for you than it did for her.

So which of these two explanation (the optical-illusion one or the time-slowing-down one) is really right? The answer depends on what system of coordinates you use to describe the black hole. According to the usual system of coordinates, called "Schwarzschild coordinates," you cross the horizon when the time coordinate t is infinity. So in these coordinates it really does take you infinite time to cross the horizon. But the reason for that is that Schwarzschild coordinates provide a highly distorted view of what's going on near the horizon. In fact, right at the horizon the coordinates are infinitely distorted (or, to use the standard terminology, "singular"). If you choose to use coordinates that are not singular near the horizon, then you find that the time when you cross the horizon is indeed finite, but the time when Penelope sees you cross the horizon is infinite. It took the radiation an infinite amount of time to reach her. In fact, though, you're allowed to use either coordinate system, and so both explanations are valid. They're just different ways of saying the same thing.

In practice, you will actually become invisible to Penelope before too much time has passed. For one thing, light is "redshifted" to longer wavelengths as it rises away from the black hole. So if you are emitting visible light at some particular wavelength, Penelope will see light at some longer wavelength. The wavelengths get longer and longer as you get closer and closer to the horizon. Eventually, it won't be visible light at all: it will be infrared radiation, then radio waves. At some point the wavelengths will be so long that she'll be unable to observe them. Furthermore, remember that light is emitted in individual packets called photons. Suppose you are emitting photons as you fall past the horizon. At some point, you will emit your last photon before you cross the horizon. That photon will reach Penelope at some finite time -- typically less than an hour for that million-solar-mass black hole -- and after that she'll never be able to see you again. (After all, none of the photons you emit *after* you cross the horizon will ever get to her.)

If a black hole existed, would it suck up all the matter in the Universe?
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Heck, no. A black hole has a "horizon," which means a region from which you can't escape. If you cross the horizon, you're doomed to eventually hit the singularity. But as long as you stay outside of the horizon, you can avoid getting sucked in. In fact, to someone well outside of the horizon, the gravitational field surrounding a black hole is no different from the field surrounding any other object of the same mass. In other words, a one-solar-mass black hole is no better than any other one-solar-mass object (such as, for example, the Sun) at "sucking in" distant objects.


What if the Sun became a black hole?
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Well, first, let me assure you that the Sun has no intention of doing any such thing. Only stars that weigh considerably more than the Sun end their lives as black holes. The Sun is going to stay roughly the way it is for another five billion years or so. Then it will go through a brief phase as a red giant star, during which time it will expand to engulf the planets Mercury and Venus, and make life quite uncomfortable on Earth (oceans boiling, atmosphere escaping, that sort of thing). After that, the Sun will end its life by becoming a boring white dwarf star. If I were you, I'd make plans to move somewhere far away before any of this happens. I also wouldn't buy any of those 8-billion-year government bonds.

But I digress. What if the Sun *did* become a black hole for some reason? The main effect is that it would get very dark and very cold around here. The Earth and the other planets would not get sucked into the black hole; they would keep on orbiting in exactly the same paths they follow right now. Why? Because the horizon of this black hole would be very small -- only about 3 kilometers -- and as we observed above, as long as you stay well outside the horizon, a black hole's gravity is no stronger than that of any other object of the same mass.

Answer 2

The key to your question is the event horizon of a black hole, which is the point of no return. At the event horizon, the force of gravity is so strong, that electromagnetic radiation, or light, cannot escape.
Think about this, standing on the earth, you do not fly out into space, because the gravitational force of the earth holds you down. But, you can shine a laser twords the sky, and the light from that laser will escape the force of the earths gravity, and beam off into space. At the event horizon of a black hole, that light would not be able to escape. That's a lot of gravity.
With that much gravitational force, funny things happen, one of which is that matter gets stretched out infinitesimally, so a black hole can certainly suck in something larger than itself, because the inside of a black hole is immesurable. This creates something even more fantastic. At the event horizon of a black hole, time ceases to exist. So once something passes the event horizon of a black hole, it is essentially suspended in time. IF somehow, you could #1 figure out how to get the infinitesimally stretched out parts of a person sucked into a black hole out, and #2 bring it out in the same way it went in, that person would have no recollection of ever being in the black hole.
Now for some questions for you.
1.Since the first law of thermodynamics states: "Matter and energy cannot be destroyed or created, but can only change form", What exactly is a black hole? A hole? or a Massive chunk of stuff? A black chunk?
2. Because a black hole sucks in more stuff with the force of gravity, How does gravity escape a black hole? What is gravity? Is it faster than light?

Answer 3

If a black hole could exist it would be a 2 to 3 solar mass sphere,3 km in diameter whose surface gravity would be such that the escape velocity would be greater than the speed of light.
No light could escape so it would be black.
2 suns like ours would be about 1 million km in diameter so 2 whole solar systems could be contained in this 3 km diameter sphere.
Any matter approaching a black hole would have to be turned into pure energy before it could penetrate the event horizon.
Though a black hole is an elegant theoretical entity there are a few very good reasons why it can't exist.

Answer 4

Information about black holes is still very sparse. We know very little about them.
From observations, it is possible for black holes to devour objects larger than themselves. This is evident when a star reaches the end of its life and collapses into itself. I image it slowly devours the object over time.
Our sun will not collapse for millions of millions of years, perhaps billions. By that time, the human race will have moved on or will be extinct.
As to what happens in a black whole... that's a mystery. Several theories boast that it transports the matter to different dimensions or perhaps it reappears somewhere else across the universe. Stephen Hawking's book "A Brief History of Time" has oodles of information on black holes. Hawking is perhaps the leading expert on black holes.
Hopefully this helps... if the information is correct...

Answer 5

1) Yes. Black holes are probably quite small in comparision to some of the things they 'suck in'.

2) Black holes don't go anywhere - they compress the matter down to a point, a massively dense singularity. Not an actual hole in space.

3) Probably, yes. We think there are supermassive black holes at the centers of most galaxies.

4) Our Sun will not become a black hole; it's not massive enough. It will expand into a red giant, then poof off it's outer layers and end up as a white dwarf star.

5) Yes, black holes can combine to become supermassive black holes.

Answer 6

A snake can gobble up an animal having a diameter much larger then the mouth of the Snake.
According to the Shool of Cosmology black holes are believed to Gobble up any planets or object that are lurking around in the space vicinity of the Black hole. Your question brings in a very good point.
Perhaps,maybe black Holes if they actually exist ,would be the Space snakes,Cleaning up and gobbleling up and prey on innocent little comets or meteorites.

Answer 7

a black hole can suck in something larger than itself becuase the size of a black hole doesnt matter, its the mass and the density. and when an object gets sucked in it just adds to the mass of the singularity, or center of the black hole. it could easily take in a whole solar system. our sun will collapse in about 4 billion years. and a black hole can merge with a black hole.

Answer 8

We can finally put this one to rest: size doesn't matter. The gravitational field generated by a black hole is more powerful than the resistance of any non-black holular object. And yes, black holes can eat star systems- not as fast as William "the Refrigerator" Perry could clear a buffet, but you get the picture.

Answer 9

it incredibly is accessible that there are blackholes wandering around between the celebrities of the Milky way, and that one in each of them could desire to collide with the Earth or sunlight and harm it. Such activities could desire to be incredibly uncommon, notwithstanding, because of the fact they are fantastically lively and if one in each of those difficulty had befell to any of the trillion different stars in the Milky way in the previous few an prolonged time, we probable could have seen it. all of the black holes that we certainly comprehend roughly (in the galactic center, Cygnus X-a million) are so a strategies away that any interplay between us and them is thousands of thousands and thousands of years sooner or later, and not going even then.