Why Do Galaxies Form Spiral Shapes?

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    Galaxies Shape Spiral
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SUMMARY

Galaxies form spiral shapes primarily due to the dynamics of angular momentum and gravitational attraction. As matter with angular momentum converges, it organizes into a disk shape, which is the most efficient configuration. The spiral structure arises from irregular intervals of matter accumulation, where each new mass attaches to the nearest gravitational source, enhancing the gravitational pull and attracting additional matter. This process creates a feedback loop that escalates the spiral formation.

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eosphorus
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how can this be explained?
 
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Space Tiger answered this very nicely when someone asked about the solar system being on a 'plane'. As matter with angular momentum comes together, a disk shape is the most natural organization. The spiral aspect is probably (as my guess) the result of matter arriving at irregular intervals and attaching itself to the nearest gravity source. As more stuff accumulates, the gravitational attraction in that area increases and attracts more matter, and thus it escalates.
 

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