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The subject of galaxy (including the Milky Way) formation is still hotly debated by the professionals. But is is quite clear that the process is a hierchical mess. The standard picture involves cold dark matter (CDM), which first forms structures (sheets, filaments, haloes) into which the baryons fall. Since the baryons can dissipate and cool by radiation), ...


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If we look at M31 (the Andromeda galaxy) and consider that it has most likely had a similar history to our own (similar size, age and make-up) then I would say that it is a galaxy which initially formed by itself and later collected other galaxies. M31 has a distinct distortion on its inner region, like a kink. This is quite possibly the remnant of an ealier ...


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Great link in your answer, @LCD3. In addition, I'm going to cover some things about the continuing evolution of the Milky Way: The Milky Way is currently merging with one or more of its satellite galaxies (I say "one or more" because several objects in its vicinity, such as the Virgo Stellar Stream, may or may not be galaxies). The major merger is with the ...


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This simulation probably gives the best answer. Added: The simulation is a 2 1/2 min video of the creation of a large galaxy from interstellar dust by collecting smaller galaxies. The time span is probably in hundreds of millions of years.


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I don't want to make any assumptions here regarding the Milky Way's presence in the Laniakea Supercluster simply because of how recent the discovery is. The findings could very well be accurate, but I don't want to base this answer off of them. Fortunately, I've found a few papers that get us around that little issue, as well as the University of Hawaii's ...


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It indeed appears the Andromeda galaxy (M31) and The Milky Way (MW) are en route to a collision. This will lead to a merger of the two galaxies forming an elliptical galaxy. The flattened disc structure of M31 and MW comes about because their gas dissipated energy but conserved momentum: a disc is the minimum energy state at given angular momentum. The gas ...


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In a few billion years, the Milky Way and Andromeda will collide. About 5 billion years, but it will take more than a thousand years for the galaxies to overlap. Chances are, there won't be any spectacular stellar collisions If the cores of the 2 galaxies collide, I would think it to be very likely that star systems will be effected and the ...


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First of all: your coordinate system (as I understand it) is not "well defined". You only provide a line (Earth --> Mily way centre) and define that as the North-South axis. You don't give a reference for the east-west axis or the up-down axis. So, I'll assume that the East-West axis lies along the plane of the Milky way and up is where the Bo├Âtes Dwarf ...


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The Kepler space telescope had a field of view along the so called Orion arm, or spur, of the galaxy. The same structure which we ourselves are inside. It basically looks along a line where the star density is the greatest within the distance that it could detect transiting planets. Less than 3% of the galactic diameter, I think. Note that the illustration ...



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