What physical process triggers the initial formation of a galactic bar through disk instability?
Answer
A small gravitational cluster triggers a cascading effect that elongates orbits
Disk instability initiates when a minor, random clustering of stars creates a denser region within the rotating disk. Due to the nature of gravity, this clump attracts more nearby material, increasing its mass. The gravitational pull of this dense region exerts a torque on surrounding stars, causing them to shift from circular orbits into elongated, oval-shaped paths that align and reinforce the bar structure.
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