🌌What makes an irregular galaxy irregular?

✨It’s usually small and has a chaotic appearance that’s likely due to recent disturbances. Some acquire their unusual shapes from galactic encounters: when galaxies pass near each other or collide, gravity pulls and distorts their shapes, often resulting in long “tails” of stars and gas.

Credit: Image of the Irregular Galaxy ESO 99-4 by NASA, ESA, the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration, and A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University)

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