What is the difference between black holes in the sun and black holes in the galaxies.?
95528
black holes in the sun are called Sunspots as whitenight3277 and saravanan already mentioned. I will describe Sunspots and Black holes in galaxy seperately here:\n\nSUNSPOTS:\n\nSunspots are dark, planet-sized regions that appear on the "surface" of the Sun. Sunspots are "dark" because they are colder than the areas around them. A large sunspot might have a temperature of about 4,000 K (about 3,700° C or 6,700° F). This is much lower than the 5,800 K (about 5,500° C or 10,000° F) temperature of the bright photosphere that surrounds the sunspots.\n\nSunspots are only dark in contrast to the bright face of the Sun. If you could cut an average sunspot out of the Sun and place it in the night sky, it would be about as bright as a full moon. Sunspots have a lighter outer section called the penumbra, and a darker middle region named the umbra.\n\nSunspots are caused by the Sun's magnetic field welling up to the photosphere, the Sun's visible "surface". The powerful magnetic fields around sunspots produce active regions on the Sun, which often lead to solar flares and Coronal Mass Ejections (CMEs). The solar activity of flares and CMEs are called "solar storms".\n\nSunspots form over periods lasting from days to weeks, and can last for weeks or even months. \n\n\nBLACK HOLE:\n black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping it except through quantum tunnelling behaviour (known as Hawking Radiation). The gravitational field is so strong that the escape velocity near it exceeds the speed of light. This implies that nothing, not even light, can escape its gravity.This makes this object invisible to the rest of the universe,hence the word "black". The term "black hole" is widespread, even though it does not refer to a hole in the usual sense, but rather a region of space from which nothing can return.
203553
By black hole and singularity we mean two different things: \nA black hole is just the area around a singularity, where the escape velocity is equal to or greater than the speed of light. The event horizon itself forms before the singularity. \n\nIf you use Schwarzchild coordinates, you'll also come up with a singularity at the event horizon, but that's only because of the coordinate system. With a different set of coordinates - Kruskal-Szekeres or Eddington-Finkelstein - the singularity at the event horizon will disappear and the math works out to singularity at r = 0.
21830
"Dark" is not produced, per se...but it is an absence of light.  A black hole absorbs light...perhaps that is what you are looking for...\n\nLook at this website...it provides a quick overview of black holes and how they are created: \nhttp://www.damtp.cam.ac.uk/user/gr/public/bh_home.html\n\nAlso...to the person below me here...the clouds do not absorb light.  They block the sun's light and reflect it back to the atmosphere therefor cutting it off from our view.  However, some of the rays that come from the sun travel through the clouds, such as UV rays.  If the clouds absorbed light, we would see nothing during an overcast day.
752294
The event horizon of a Black Hole is spherical.\n\nThe circumference is 2 pi times the radius, where the radius here means something rather different than "the distance to the center", since space is so warped.\n\nThe radius is proportional to the mass of the black hole (not the cube root of the mass, as you might at first think).  The radius is about 10 kilometers for the mass of the Sun, so 20 kilometers for twice the mass of the Sun, etc.
563951
The sun will not become a black hole, it is not currently massive enough.\nThe sun will "die" by first expanding into a red giant and finally cool down to become a white dwarf.
579859
I assume you mean "star" and not "sun", as in OUR sun, in the first question.  In that case, a supernova is essentially the spectacular explosion that occurs when a star of a significant sized mass ends its life.  IN that case, all the elements with a periodic table number higher than oxygen are created.  In addition, the remaining core of the dead star becomes so dense, that it creates an object that even light can't escape.  This object is now a black hole.\n\nOur sun is not big enough to supernova, therefore it will just die out and become a black dwarf when it is dead.\n\nDefinition from the Big Wiki...\n\nhttp://en.wikipedia.org/wiki/Supernova
637323
The Sun does rotate/turn on an axis by itself, but it also rotates around a huge black hole in the center of our galaxy, and it takes a very, very, VERY long time to complete one rotation.\n\nIt rotates around the black hole with similar principles to that of earth revolving around the sun, and yes, eventually it will be swallowed by the black hole.
371561
As per the current observations and information SMBH (super-mass-...-...) reside in the center of galaxies. Most (not all) of the observable galaxies have a SMBH. There is still an open question that did galaxies form first & then they harboured a SMBH over time OR did the black holes got created first & they pulled over stuff from around & created the galaxy/galaxies, its like a chicken and the egg problem :)
425326
The spiral arms and the "halo" in the center, which is thought to be massive amounts of stars and light trapped in an extremly large black hole.\n\nAlso, there is evidence in super nova explosions that show the propable formations of large black holes and, eventually, galaxies.
368768
A black hole is were a star once lived. Try this link for more details:\n\nhttp://www.cem.msu.edu/~cem181h/projects/98/TBA/Created.htm
989936
Curved spacetime.\n\nThere is nothing unduly special about the event horizon (ie it has no discontinuities). And very large black holes do not have unduly curved spacetime at their event horizons (the curvature of the supermassive black hole at the centre of our galaxy is on 20 times greater than that here on Earth, and here on Earth the curvature is pretty much undetectable).
252532
A black hole is a super dense hole in space with an extremely powerful gravitational pull (not even light can escape).  The 12 months come from the ancient Romans, and to the best of my knowledge aren't related to constellations.  Life on Earth evolved from a "chemical soup" of elements.  These elements cam together to form amino acids, which formed proteins, which over billions of year multiplied and evolved into the 10 million + species on earth today.
722109
It is possible that black holes are the catalyst behind the big crunch, which is the end version of the big bang. Once all of the black holes in existence collect enough matter and energy, they could combine gravitationaly to create one massive black hole that simply repeats the big bang over and over.\n\nBlack holes do not reflect anything, so I don't believe the ignition of the sun was caused by a black hole. \nBlack Hole Info:\n1.They represent matter/energy in its purest form. (All matter and energy is coalesced into one single state of energy)\n\n2.They represent the possible end of our universe.(big crunch)\n\n3.They are the single largest gravitational entity theorized to exist.\n\n4.They are one of the few places that prohibit the propagation of light, so no reflection.\n\n5.The laws of nature at a black hole are completely different from anywhere else in the universe.
557703
Black holes are huge concentrations of mass in a very small area.  So small that it is too small to contain conventional matter as we understand it.  There is a perimeter around a black hole known as the event horizon.  Beyond this point, nothing, not even light can escape the gravitational pull of a black hole.  If you were to be able to stand on the event horizon and have telescopic vision like Superman, looking tangent to the event horizon, you would see the back of your head.
960972
The denser the black hole, the larger it's event horizon would be.\n\nApplying the Einstein Field Equations to collapsing stars, German astrophysicist Kurt Schwarzschild deduced the critical radius for a given mass at which matter would collapse into an infinitely dense state known as a singularity. For a black hole whose mass equals 10 suns, this radius is about 30 kilometers or 19 miles, which translates into a critical circumference of 189 kilometers or 118 miles.
1093571
Black holes are collapsed and therefore the last stage of supergiant stars.  They have the greatest density of any known objects in the universe.  However, the nearest black holes to the earth are so far away that they will never adversely affect humans.
515493
The galaxy is everything you see at night when you look up in the sky. Stars, planets, moons, asteroids, meteors, comets, or any other terrestrial body. I think there's just one black hole at the middle of the galaxy.