What usually causes galaxies to have an irregular, asymmetric shape?
Answer
Gravitational interactions and collisions
Irregular galaxies lack symmetry because their structure has been distorted by external forces. Common causes include gravitational interactions, such as near-misses or direct collisions with other galaxies. These encounters scramble the internal organization of the galaxy and compress clouds of gas, which often leads to intense, localized bursts of star formation.
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Types of Galaxies in Space - Spiral, Elliptical, Irregular plus more
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