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#11
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"G=EMC^2 Glazier" wrote in message
... Flat because they are spinning fast and most of the galaxy's gravity is located at its core,and its horizon. It is a pin wheel. Helps if its flat rim is in our exact line of view. Bert Sorry Bert, but the rotation curves of spiral galaxies suggest this is not true. In many spirals, the tangential velocity of stars is fairly constant with increasing distance from the centre. If most of the mass were at the centre, the speed would be expected to decrease with increasing distance from the centre. Dave |
#12
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"G=EMC^2 Glazier" wrote in message ... Flat because they are spinning fast and most of the galaxy's gravity is located at its core,and its horizon. It is a pin wheel. Helps if its flat rim is in our exact line of view. Bert Eh? what does 'and its horizon' mean? |
#13
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OG What I mean by horizon is its round outer edge. The edge has to be
turning faster. This would cause the galaxy to spirral out. I would like to know if every galaxy that is flat has a bulging hub. Bert |
#14
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Take a look at a pizza crust as it is being made in shops that "spins them" to
size. The spinning takes the large lump of dough and spreads it out more or less evenly creating a larger and larger disk while all of the time its hieght shrinks and the disk becomes flatter and thinner. Most galaxies and solar systems are formed in a simular fashion. Those galaxies and solar systems that are shaped diferently have had some sort of external influence... colliding galaxies or star systems or even rogue planets passing thru a stellar system can change the orbital paths of planets it may hit or even pass near too. Richard Dickison wrote: Why are most galaxies and solar systems 'flat'? If there is a cloud of dust/gas that starts to coalesce around a localized density in the middle of the dust/gas, it seems it would attract from all 3 dimensions equally. But galaxies and solar systems attract primarily in a single plane. What happened to all the debris above/below the plane? I understand there will probably be an unequal distribution of matter surrounding the central object and there will consequently be a resultant angular momentum after a while. But that doesn't seem to explain why there still isn't debris spiraling in from above/below the primary plane. |
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