Do all galaxies contain supermassive black holes, if so, where are they located in a galaxy?
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 :)
845717
An international team of astronomers from France, Italy, the UK and Australia has found a previously unknown galaxy colliding with our own Milky Way. This newly-discovered galaxy takes the record for the nearest galaxy to the centre of the Milky Way. Called the Canis Major dwarf galaxy after the constellation in which it lies, it is about 25000 light years away from thesolar system and 42000 light years from the centre of the Milky Way. This i closer than the Sagittarius dwarf galaxy, discovered in 1994, which is also colliding with the Milky Way. The discovery shows that the Milky Way is building up its own disk by absorbing small satellite galaxies. The research is to be published in the Monthly Notices of the Royal Astronomical Society within the next few weeks.\n\nThe discovery of the Canis Major dwarf was made possible by a recent survey of the sky in infrared light (the Two-Micron All Sky Survey or "2MASS"), which has allowed astronomers to look beyond the clouds of dust in the disk of the Milky Way. Until now, the dwarf galaxy lay undetected behind the dense disk. "It's like putting on infrared night-vision goggles," says team-member Dr Rodrigo Ibata of Strasbourg Observatory. "We are now able to study a part of the Milky Way that has been previously out of sight".\n\nThe new dwarf galaxy was detected by its M-giant stars =AD cool, red stars that shine especially brightly in infrared light. "We have used these rare M-giant stars as beacons to trace out the shape and location of the new galaxy because its numerous other stars are too faint for us to see," explains Nicolas Martin, also of Strasbourg Observatory. "They are particularly useful stars as we can measure their distances, and so map out the three-dimensional structure of distant regions of the Milky Way disk." In this way, the astronomers found the main dismembered corpse of the dwarf galaxy in Canis Major and long trails of stars leading back to it. It seems that streams of stars pulled out of the cannibalised Canis Major galaxy not only contribute to the outer reaches of the Milky Way's disk, but may also pass close to the Sun.\n\nAstronomers currently believe that large galaxies like the Milky Way grew to their present majestic proportions by consuming their smaller galactic neighbours. They have found that cannibalised galaxies add stars to the vast haloes around large galaxies. However, until now, they did not appreciate that even the disks of galaxies can grow in this fashion. Computer simulations show that the Milky Way has been taking stars from the Canis Major dwarf and adding them to its own disk - and will continue to do so.\n\n"On galactic scales, the Canis Major dwarf galaxy is a lightweight of about only one billion Suns," said Dr. Michele Bellazzini of Bologna Observatory. "This small galaxy is unlikely to hold together much longer. It is being pushed and pulled by the colossal gravity of our Milky Way, which has been progressively stealing its stars and pulling it apart." Some remnants of the Canis Major dwarf form a ring around the disk of the Milky Way.\n\n"The Canis Major dwarf galaxy may have added up to 1% more mass to our Galaxy," said Dr Geraint Lewis of the University of Sydney. "This is also an important discovery because it highlights that the Milky Way is not in its middle age - it is still forming." "Past interactions of the sort we are seeing here could be responsible for some of the exquisite detail we see today in the structure of the Galaxy," says Dr Michael Irwin of the University of Cambridge.
440062
The universe contains approximately  200,000,000,000,000,000,000 (200 BILLION BILLION) stars in galaxies scattered throughout the universe.  Our solar system is located in one of the spiral arms of the Milky Way galaxy.  The Milky Way galaxy contains approx. 200,000,000,000 stars.  \n\nThe universe is the largest of the three organizational structures in your question.  \n\nHope this helps!
1112921
No, but there are other Galaxies in the Universe
99706
In 1994 astronomers employing the Hubble Space Telescope announced that they had found conclusive evidence of a supermassive black hole in the M87 galaxy in the constellation Virgo.
285507
Solar winds,nebulars,planets,milky way,\nmeteors,comets,darkness,\nsolar systems,black holes,\npulsars,nova's,super nova's.\nsatalites,Asteroids.\nspiral galaxys,oval galaxys\nhelp u.
890850
Yes, our galaxy (and the local group) is generally heading in the direction of the virgo cluster of galaxies. All together, we are moving in the direction of a much larger structure called the 'Great Attractor' that is in the direction of the constallation of Centaurus. I'm guessing that this is what you heard about.\n\nhttp://en.wikipedia.org/wiki/Great_Attractor
67361
At least 100 billion galaxies are known to exist in the Universe. Our galaxy is a spiral one, so in terms of structure it consists of galactic core and several spiral arms. In terms of composition it includes stars, planets (made from regular matter, including atoms of all naturally occurring elements and ions), galactic gas and dust (made from regular matter, mostly hydrogen and helium as far as the gas goes, and hydrogen, carbon, silicon, oxygen and some other elements as far as the dust goes), dark matter and dark energy (there is little known about the last two).
772685
largest galaxy--\n\nThe Andromeda Galaxy (IPA: /ˌanˈdrɒmədə/, also known as Messier 31, M31, or NGC 224; older texts often called it the Andromeda Nebula) is a barred spiral galaxy approximately 2.5[2] million light-years away in the constellation Andromeda, which lies in the northern hemisphere of the sky.\n\nAndromeda was believed to be the largest galaxy of the Local Group of galaxies, which consists of the Andromeda Galaxy, the Milky Way Galaxy, and the Triangulum Galaxy, and about 30 other smaller galaxies. Due to recent findings based on improved measurements and data, scientists now believe that the Milky Way contains more dark matter and may be the most massive in the grouping.[5] However, recent observations by the Spitzer Space Telescope revealed that M31 contains one trillion (1012) stars, greatly exceeding the number of stars in our own galaxy.[6]\n\nThe Andromeda Galaxy is easily visible to the naked eye in a moderately dark sky, though such a sky is available only in smaller towns and isolated areas reasonably far from population centers and sources of light pollution. It appears quite small without a telescope because only the central part is bright enough to be visible, but the full angular diameter of the galaxy is seven times that of the full moon.
1171072
Not at all.  The Milky Way, Andromeda and a few other galaxies are in the "local group".  The galaxies in this group orbit around each other.  Just like our planets.  At times some planets will be seen to recede from us and at other times they will be getting closer as all go along in their respective orbits.
515904
yes, black holes really exist.  there is enough evidence for their existence that almost all astronomers would accept that they do.\n\nread this page:\nhttp://en.wikipedia.org/wiki/Black_hole
446996
Do you mean SPIRAL galaxies?\n\nCompare the Milky Way (our "spiral" galaxy) with others in the universe. There's a classification for spirals, so it shouldn't be that hard to write a paper on it (without be a physicist)
59422
Our “address” is: \n\nThe third planet of the star “Sol”, which is the name of the sun. \n\nSol is about 27,000 light years from the center of the Milky Way galaxy, on the inner rim of the “Orion Arm”. The Milky Way galaxy—our galaxy—has four “spiral arms”. An “arm” of a galaxy is a very huge arc of stars that extend out from the center of the galaxy in a long spiral. \n\nThe "Milky Way" galaxy is in the “Local Group”. Galaxies are clustered into groups of galaxies, with wide areas of semi-nothingness between the groups. We have named the group of which our galaxy is part the “Local Group” for obvious reasons. \n\nThe “Local Group” is part of the “Virgo Supercluster”. A supercluster is a cluster of groups of galaxies. \n\nThe “Virgo Supercluster” is one of many clusters and superclusters in the known universe. There is no “official name” of our universe, since it is the only universe of which we know. It is therefore usually just called “the universe”. \n\nOur address is therefore the third planet of the star Sol, on the inner rim of the Orion Arm of the Milky Way galaxy, in the Local Group of galaxies, within the Virgo Supercluster, in "the universe". \n\nNow that you know the address, from whom are you expecting mail?
111888
I guess you mean dark matter. We cant see it but we know it´s there. It has to be or the galaxies wouldn´t be galaxies. Dark matter doesn´t seem to emitt or absorb radiation like normal matter. In short: we dont know what it is.
138345
Just about all astronomers agree that at the center of our Milky Way Galaxy (and probably at the center of most other galaxies) lies a supermassive black hole. It probably has a mass at least 2-million times that of our Sun, and is approximately 96-million miles in diameter.\n\nThese figures come from careful observation and measurment of the motions of other objects near the galactic center.\n\nThis page has more info, plus a photo ---\nhttp://antwrp.gsfc.nasa.gov/apod/ap021018.html
531320
They really don't. Galaxies come in all sorts of shapes and sizes, spiral, elliptical, round, etc. Few are rotating though, and some in different directions. All seem to be moving away from each other, though, as most scientists agree that the Universe is still expanding,thus blowing a few holes in the old "big bang" theories.
112797
Galaxies are constantly colliding with eachother because of gravitational attraction.  In fact, most galaxies are in clusters of galaxies that stay in clusters because of a mutual gravitational attraction,(including our own milky way), so in a sense, these clusters of galaxies have somewhat of a jumbled orbit around eachother untill they collide and form new galaxies.  These orbits are much different than planetary orbits in that they are not as uniform.